Sip help

hi. i want to analyze the my voip for getting knowledge of how things are actually happening? i.e. the packet exchange, the sip methods, responses, etc. i have used wireshark and sip workbench. i have found sip workbench more useful.i have captured the following packet flow. can somebody explain it to me?

    192.168.44.4                    172.26.5.55
    |                               |
1 : |U----------SUBSCRIBE---------->|
2 : |U-----------REGISTER---------->|
3 : |<--401 Unauthorized/REGISTER--U|
4 : |<--401 Unauthorized/SUBSCRIBE-U|
5 : |U-----------REGISTER---------->|
6 : |U----------SUBSCRIBE---------->|
7 : |<-------200 OK/REGISTER-------U|
8 : |<-------200 OK/SUBSCRIBE------U|
9 : |U-----------REGISTER---------->|
10: |<--401 Unauthorized/REGISTER--U|
11: |U-----------REGISTER---------->|
12: |<-----------OPTIONS-----------U|
13: |<-------200 OK/REGISTER-------U|
14: |U--------200 OK/OPTIONS------->|
15: |U----------SUBSCRIBE---------->|
16: |U----------SUBSCRIBE---------->|
17: |<--401 Unauthorized/SUBSCRIBE-U|
18: |<--401 Unauthorized/SUBSCRIBE-U|
19: |U----------SUBSCRIBE---------->|
20: |U----------SUBSCRIBE---------->|
21: |<---404 Not Found/SUBSCRIBE---U|
22: |<-------200 OK/SUBSCRIBE------U|
23: |<------------NOTIFY-----------U|
24: |U--------200 OK/NOTIFY-------->|
25: |U------------INVITE----------->|
26: |<---401 Unauthorized/INVITE---U|
27: |U-------------ACK------------->|
28: |U------------INVITE----------->|
29: |<------100 Trying/INVITE------U|
30: |<--------200 OK/INVITE--------U|
31: |U--------video/H263(34)------->|
32: |<--------audio/PCMU(0)--------U|
33: |U-------------ACK------------->|
34: |U--------audio/PCMU(0)-------->|
35: |U--audio/telephone-event(101)->|
36: |<-------------INFO------------U|
37: |U-415 Unsupported Media Type/->|
38: |U-----------REGISTER---------->|
39: |<--401 Unauthorized/REGISTER--U|
40: |U-----------REGISTER---------->|
41: |<-------200 OK/REGISTER-------U|
42: |<-----------OPTIONS-----------U|
43: |U----------SUBSCRIBE---------->|
44: |U--------200 OK/OPTIONS------->|
45: |<--401 Unauthorized/SUBSCRIBE-U|
46: |U----------SUBSCRIBE---------->|
47: |<-------200 OK/SUBSCRIBE------U|
48: |<------------NOTIFY-----------U|
49: |U--------200 OK/NOTIFY-------->|
50: |U-----------REGISTER---------->|
51: |<--401 Unauthorized/REGISTER--U|
52: |U-----------REGISTER---------->|
53: |<-----------OPTIONS-----------U|
54: |<-------200 OK/REGISTER-------U|
55: |U----------SUBSCRIBE---------->|
56: |<--401 Unauthorized/SUBSCRIBE-U|
57: |U--------200 OK/OPTIONS------->|
58: |U----------SUBSCRIBE---------->|
59: |<-------200 OK/SUBSCRIBE------U|
60: |<------------NOTIFY-----------U|
61: |U--------200 OK/NOTIFY-------->|
62: |U-------------BYE------------->|

Generated SIP Workbench by BreakPoint Software, Inc. (www.sipworkbench.com)


<<<<<<<< Msg #1 / Packet #26: 192.168.44.4:55806 --> 172.26.5.55:5060 >>>>>>>>
SUBSCRIBE sip:asterisk@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-c23d2a2687466c42-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:55806;rinstance=0be8d056ec80d977>
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as62124caa
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=ce50ae7a
Call-ID: OWQ3NmU5ZDRiY2Y2OWY0NjVjNGZkNWYxMzhjZTA4MzQ.
CSeq: 40 SUBSCRIBE
Expires: 0
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="7df68ef8",uri="sip:asterisk@172.26.5.55",response="785172b0e4cb33eae967ee8eb398ea5d",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<<<< Msg #2 / Packet #27: 192.168.44.4:55806 --> 172.26.5.55:5060 >>>>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-cb58db32796b420e-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:55806;rinstance=0be8d056ec80d977>;expires=0
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=5c41566b
Call-ID: NWU5ZDJiNTQ2OGJhZDY4NjhiMjQ1OGZjODUxYjJlNmM.
CSeq: 39 REGISTER
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="13f98e32",uri="sip:172.26.5.55:5060",response="b2039370c4fe8c0361a564834028192e",algorithm=MD5
Content-Length: 0


<<<<<<<< Msg #3 / Packet #28: 172.26.5.55:5060 --> 192.168.44.4:55806 >>>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-cb58db32796b420e-1---d8754z-;received=192.168.44.4;rport=55806
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=5c41566b
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as13c56411
Call-ID: NWU5ZDJiNTQ2OGJhZDY4NjhiMjQ1OGZjODUxYjJlNmM.
CSeq: 39 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="78c0ca97", stale=true
Content-Length: 0


<<<<<<<< Msg #4 / Packet #29: 172.26.5.55:5060 --> 192.168.44.4:55806 >>>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-c23d2a2687466c42-1---d8754z-;received=192.168.44.4;rport=55806
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=ce50ae7a
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as62124caa
Call-ID: OWQ3NmU5ZDRiY2Y2OWY0NjVjNGZkNWYxMzhjZTA4MzQ.
CSeq: 40 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="4b077598", stale=true
Content-Length: 0


<<<<<<<< Msg #5 / Packet #31: 192.168.44.4:55806 --> 172.26.5.55:5060 >>>>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-8009ab404123f168-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:55806;rinstance=0be8d056ec80d977>;expires=0
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=5c41566b
Call-ID: NWU5ZDJiNTQ2OGJhZDY4NjhiMjQ1OGZjODUxYjJlNmM.
CSeq: 40 REGISTER
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="78c0ca97",uri="sip:172.26.5.55:5060",response="cb1a378c620053869bfcd9ab009cc69f",algorithm=MD5
Content-Length: 0


<<<<<<<< Msg #6 / Packet #32: 192.168.44.4:55806 --> 172.26.5.55:5060 >>>>>>>>
SUBSCRIBE sip:asterisk@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-350d1717bb482d48-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:55806;rinstance=0be8d056ec80d977>
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as62124caa
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=ce50ae7a
Call-ID: OWQ3NmU5ZDRiY2Y2OWY0NjVjNGZkNWYxMzhjZTA4MzQ.
CSeq: 41 SUBSCRIBE
Expires: 0
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="4b077598",uri="sip:asterisk@172.26.5.55",response="a38490f4f14f8420a39456b4635226cd",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<<<< Msg #7 / Packet #33: 172.26.5.55:5060 --> 192.168.44.4:55806 >>>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-8009ab404123f168-1---d8754z-;received=192.168.44.4;rport=55806
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=5c41566b
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as13c56411
Call-ID: NWU5ZDJiNTQ2OGJhZDY4NjhiMjQ1OGZjODUxYjJlNmM.
CSeq: 40 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 0
Date: Fri, 10 Feb 2012 05:56:49 GMT
Content-Length: 0


<<<<<<<< Msg #8 / Packet #34: 172.26.5.55:5060 --> 192.168.44.4:55806 >>>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:55806;branch=z9hG4bK-d8754z-350d1717bb482d48-1---d8754z-;received=192.168.44.4;rport=55806
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=ce50ae7a
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as62124caa
Call-ID: OWQ3NmU5ZDRiY2Y2OWY0NjVjNGZkNWYxMzhjZTA4MzQ.
CSeq: 41 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 0
Content-Length: 0


<<<<<<<< Msg #9 / Packet #58: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-8a4a021dd043f83e-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 1 REGISTER
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Content-Length: 0


<<<<<<< Msg #10 / Packet #59: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-8a4a021dd043f83e-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as3135faa0
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 1 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="0cd61e18"
Content-Length: 0


<<<<<<< Msg #11 / Packet #60: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-653d50431d2b583d-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 2 REGISTER
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="0cd61e18",uri="sip:172.26.5.55:5060",response="9df9b76435772de0559ce1e07a1f0cbd",algorithm=MD5
Content-Length: 0


<<<<<<< Msg #12 / Packet #61: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
OPTIONS sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK7918b22e;rport
Max-Forwards: 70
From: "asterisk" <sip:asterisk@172.26.5.55>;tag=as502c3f7c
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
Contact: <sip:asterisk@172.26.5.55>
Call-ID: 1276a5cd3382f5293f5cd6ad6de3091a@172.26.5.55
CSeq: 102 OPTIONS
User-Agent: Asterisk
Date: Fri, 10 Feb 2012 05:56:53 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0


<<<<<<< Msg #13 / Packet #62: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-653d50431d2b583d-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as3135faa0
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 2 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 60
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;expires=60
Date: Fri, 10 Feb 2012 05:56:53 GMT
Content-Length: 0


<<<<<<< Msg #14 / Packet #63: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK7918b22e;rport=5060
Contact: <sip:192.168.44.4:57515>
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=8c119d34
From: "asterisk"<sip:asterisk@172.26.5.55>;tag=as502c3f7c
Call-ID: 1276a5cd3382f5293f5cd6ad6de3091a@172.26.5.55
CSeq: 102 OPTIONS
Accept: application/sdp
Accept-Language: en
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
Allow-Events: presence, message-summary, tunnel-info
Content-Length: 0


<<<<<<< Msg #15 / Packet #64: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
SUBSCRIBE sip:5801@172.26.5.55:5060;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-f046321a9848e85f-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 1 SUBSCRIBE
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Event: message-summary
Content-Length: 0


<<<<<<< Msg #16 / Packet #65: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
SUBSCRIBE sip:%23any-dn%23@172.26.5.55:5060;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-0404c6763a4de02e-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:%23any-dn%23@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=291f2e00
Call-ID: ZTRhYjc5NDEyN2I2MDE4NmU2NjIzNzc2ZGNhM2Q4ZGQ.
CSeq: 1 SUBSCRIBE
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Event: presence
Content-Length: 0


<<<<<<< Msg #17 / Packet #66: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-f046321a9848e85f-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 1 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="58245c48"
Content-Length: 0


<<<<<<< Msg #18 / Packet #67: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-0404c6763a4de02e-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=291f2e00
To: "Khan"<sip:%23any-dn%23@172.26.5.55:5060>;tag=as17624b57
Call-ID: ZTRhYjc5NDEyN2I2MDE4NmU2NjIzNzc2ZGNhM2Q4ZGQ.
CSeq: 1 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="353fc30e"
Content-Length: 0


<<<<<<< Msg #19 / Packet #68: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
SUBSCRIBE sip:5801@172.26.5.55:5060;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-cc3351116e648b5b-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 2 SUBSCRIBE
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="58245c48",uri="sip:5801@172.26.5.55:5060;transport=UDP",response="4ebb5f6bc25577b5e2132dec4884740f",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<<< Msg #20 / Packet #69: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
SUBSCRIBE sip:%23any-dn%23@172.26.5.55:5060;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-31245100f1486840-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:%23any-dn%23@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=291f2e00
Call-ID: ZTRhYjc5NDEyN2I2MDE4NmU2NjIzNzc2ZGNhM2Q4ZGQ.
CSeq: 2 SUBSCRIBE
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="353fc30e",uri="sip:%23any-dn%23@172.26.5.55:5060;transport=UDP",response="5ad16d01a5c56fdc2f2b3931ca9737da",algorithm=MD5
Event: presence
Content-Length: 0


<<<<<<< Msg #21 / Packet #70: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-31245100f1486840-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=291f2e00
To: "Khan"<sip:%23any-dn%23@172.26.5.55:5060>;tag=as17624b57
Call-ID: ZTRhYjc5NDEyN2I2MDE4NmU2NjIzNzc2ZGNhM2Q4ZGQ.
CSeq: 2 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0


<<<<<<< Msg #22 / Packet #71: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-cc3351116e648b5b-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 2 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 60
Contact: <sip:5801@172.26.5.55>;expires=60
Content-Length: 0


<<<<<<< Msg #23 / Packet #72: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>>
NOTIFY sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK0f3a1a54;rport
Max-Forwards: 70
Route: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
From: "asterisk" <sip:asterisk@172.26.5.55>;tag=as2db341b8
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=a95a7c59
Contact: <sip:asterisk@172.26.5.55>
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 102 NOTIFY
User-Agent: Asterisk
Event: message-summary
Content-Type: application/simple-message-summary
Subscription-State: active
Content-Length: 92

Messages-Waiting: yes
Message-Account: sip:asterisk@172.26.5.55
Voice-Message: 1/0 (0/0)

<<<<<<< Msg #24 / Packet #73: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK0f3a1a54;rport=5060
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=a95a7c59
From: "asterisk"<sip:asterisk@172.26.5.55>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 102 NOTIFY
User-Agent: 3CXPhone 5.0.14900.0
Content-Length: 0


<<<<<<< Msg #25 / Packet #102: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
INVITE sip:991@172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-b9321f598b2f1c46-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:991@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Content-Type: application/sdp
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Content-Length: 404

v=0
o=3cxVCE 158633250 81686865 IN IP4 192.168.44.4
s=3cxVCE Audio Call
c=IN IP4 192.168.44.4
t=0 0
m=audio 40034 RTP/AVP 0 8 3 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=sendrecv
m=video 40004 RTP/AVP 34
c=IN IP4 192.168.44.4
a=rtpmap:34 H263/90000
a=fmtp:34 QCIF=1;CIF=1;SQCIF=1;CIF4=1;
a=sendrecv

<<<<<<< Msg #26 / Packet #103: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-b9321f598b2f1c46-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
To: <sip:991@172.26.5.55:5060>;tag=as4332975d
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 1 INVITE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="7e25ea7b"
Content-Length: 0


<<<<<<< Msg #27 / Packet #104: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
ACK sip:991@172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-b9321f598b2f1c46-1---d8754z-;rport
Max-Forwards: 70
To: <sip:991@172.26.5.55:5060>;tag=as4332975d
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 1 ACK
Content-Length: 0


<<<<<<< Msg #28 / Packet #105: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
INVITE sip:991@172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-7162eb3bdd00db5a-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:991@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 2 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Content-Type: application/sdp
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="7e25ea7b",uri="sip:991@172.26.5.55:5060",response="0de65b4306776b43c9906cb0e44790be",algorithm=MD5
Content-Length: 404

v=0
o=3cxVCE 158633250 81686865 IN IP4 192.168.44.4
s=3cxVCE Audio Call
c=IN IP4 192.168.44.4
t=0 0
m=audio 40034 RTP/AVP 0 8 3 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=sendrecv
m=video 40004 RTP/AVP 34
c=IN IP4 192.168.44.4
a=rtpmap:34 H263/90000
a=fmtp:34 QCIF=1;CIF=1;SQCIF=1;CIF4=1;
a=sendrecv

<<<<<<< Msg #29 / Packet #106: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-7162eb3bdd00db5a-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
To: <sip:991@172.26.5.55:5060>
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 2 INVITE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Contact: <sip:991@172.26.5.55>
Content-Length: 0


<<<<<<< Msg #30 / Packet #107: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-7162eb3bdd00db5a-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
To: <sip:991@172.26.5.55:5060>;tag=as7eb1068a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 2 INVITE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Contact: <sip:991@172.26.5.55>
Content-Type: application/sdp
Content-Length: 354

v=0
o=root 929714986 929714986 IN IP4 172.26.5.55
s=Asterisk PBX 1.6.2.17.2
c=IN IP4 172.26.5.55
b=CT:384
t=0 0
m=audio 19230 RTP/AVP 0 8 3 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
m=video 16122 RTP/AVP 34
a=rtpmap:34 H263/90000
a=sendrecv

<<<<<< Msg #31 / Packet #108: 192.168.44.4:40004 --> 172.26.5.55:16122 >>>>>>>
Payload: video/H263(34)
Source : 192.168.44.4:40004
Destination : 172.26.5.55:16122
Total Packets : 4160
Out of Order Packets : 0
Dropped Packets : 0
Elapsed time (s) : 121.240251
Total Bytes : 709928
Average KBytes/Sec : 5.72
Average Jitter (ms) : 29.13
Start/End Packet # : 108/17111

<<<<<< Msg #32 / Packet #118: 172.26.5.55:19230 --> 192.168.44.4:40034 >>>>>>>
Payload: audio/PCMU(0)
Source : 172.26.5.55:19230
Destination : 192.168.44.4:40034
Total Packets : 5811
Out of Order Packets : 0
Dropped Packets : 2
Elapsed time (s) : 121.329889
Total Bytes : 1243554
Average KBytes/Sec : 10.01
Average Jitter (ms) : 20.88
Start/End Packet # : 118/17119

<<<<<<< Msg #33 / Packet #120: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
ACK sip:991@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-17568a27a664a15c-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:991@172.26.5.55:5060>;tag=as7eb1068a
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 2 ACK
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="7e25ea7b",uri="sip:991@172.26.5.55:5060",response="0de65b4306776b43c9906cb0e44790be",algorithm=MD5
Content-Length: 0


<<<<<< Msg #34 / Packet #122: 192.168.44.4:40034 --> 172.26.5.55:19230 >>>>>>>
Payload: audio/PCMU(0)
Source : 192.168.44.4:40034
Destination : 172.26.5.55:19230
Total Packets : 6064
Out of Order Packets : 0
Dropped Packets : 196
Elapsed time (s) : 121.260819
Total Bytes : 1297696
Average KBytes/Sec : 10.45
Average Jitter (ms) : 19.99
Start/End Packet # : 122/17116

<<<<<< Msg #35 / Packet #511: 192.168.44.4:40034 --> 172.26.5.55:19230 >>>>>>>
Payload: audio/telephone-event(101)
Source : 192.168.44.4:40034
Destination : 172.26.5.55:19230
Total Packets : 112
Out of Order Packets : 0
Dropped Packets : 238
Elapsed time (s) : 12.679358
Total Bytes : 6496
Average KBytes/Sec : 0.50
Average Jitter (ms) : 113.19
Start/End Packet # : 511/2204

<<<<<< Msg #36 / Packet #1416: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
INFO sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK1327e443;rport
Max-Forwards: 70
From: <sip:991@172.26.5.55:5060>;tag=as7eb1068a
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
Contact: <sip:991@172.26.5.55>
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 102 INFO
User-Agent: Asterisk
Content-Type: application/media_control+xml
Content-Length: 205

<?xml version="1.0" encoding="utf-8" ?>
 <media_control>
  <vc_primitive>
   <to_encoder>
    <picture_fast_update>
    </picture_fast_update>
   </to_encoder>
  </vc_primitive>
 </media_control>

<<<<<< Msg #37 / Packet #1425: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
SIP/2.0 415 Unsupported Media Type
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK1327e443;rport=5060
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
From: <sip:991@172.26.5.55:5060>;tag=as7eb1068a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 102 INFO
Accept: application/simple-message-summary, application/dtmf, application/dtmf-relay, application/component-call-info
Content-Length: 0


<<<<<< Msg #38 / Packet #6723: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-83548e5e2d747e73-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 3 REGISTER
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="0cd61e18",uri="sip:172.26.5.55:5060",response="9df9b76435772de0559ce1e07a1f0cbd",algorithm=MD5
Content-Length: 0


<<<<<< Msg #39 / Packet #6725: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-83548e5e2d747e73-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as323320b5
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 3 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="3f32c36b"
Content-Length: 0


<<<<<< Msg #40 / Packet #6740: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-3839ad7890376828-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 4 REGISTER
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="3f32c36b",uri="sip:172.26.5.55:5060",response="a1a942704fb3c33b74e85c3dda94b254",algorithm=MD5
Content-Length: 0


<<<<<< Msg #41 / Packet #6742: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-3839ad7890376828-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as323320b5
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 4 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 60
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;expires=60
Date: Fri, 10 Feb 2012 05:57:47 GMT
Content-Length: 0


<<<<<< Msg #42 / Packet #6743: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
OPTIONS sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK39b6e78e;rport
Max-Forwards: 70
From: "asterisk" <sip:asterisk@172.26.5.55>;tag=as463f718e
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
Contact: <sip:asterisk@172.26.5.55>
Call-ID: 7deb4c9f4db5d3c822969a7f12bf3f4d@172.26.5.55
CSeq: 102 OPTIONS
User-Agent: Asterisk
Date: Fri, 10 Feb 2012 05:57:47 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0


<<<<<< Msg #43 / Packet #6761: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
SUBSCRIBE sip:asterisk@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-820f1f7f29551f1d-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 4 SUBSCRIBE
Expires: 60
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="58245c48",uri="sip:asterisk@172.26.5.55",response="980f180a2c0e50ede1831efd0f2f8825",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<< Msg #44 / Packet #6762: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK39b6e78e;rport=5060
Contact: <sip:192.168.44.4:57515>
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=f6632f68
From: "asterisk"<sip:asterisk@172.26.5.55>;tag=as463f718e
Call-ID: 7deb4c9f4db5d3c822969a7f12bf3f4d@172.26.5.55
CSeq: 102 OPTIONS
Accept: application/sdp
Accept-Language: en
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
Allow-Events: presence, message-summary, tunnel-info
Content-Length: 0


<<<<<< Msg #45 / Packet #6764: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-820f1f7f29551f1d-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 4 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="44a00fa5", stale=true
Content-Length: 0


<<<<<< Msg #46 / Packet #6779: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
SUBSCRIBE sip:asterisk@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-dd1b9f15370ee458-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 5 SUBSCRIBE
Expires: 60
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="44a00fa5",uri="sip:asterisk@172.26.5.55",response="ce80b8cf9a3288a1364ac9d8926f809c",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<< Msg #47 / Packet #6781: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-dd1b9f15370ee458-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 5 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 60
Contact: <sip:asterisk@172.26.5.55>;expires=60
Content-Length: 0


<<<<<< Msg #48 / Packet #6782: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>>
NOTIFY sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK0f3a1a54;rport
Max-Forwards: 70
Route: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
From: "asterisk" <sip:asterisk@172.26.5.55>;tag=as2db341b8
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=a95a7c59
Contact: <sip:asterisk@172.26.5.55>
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 103 NOTIFY
User-Agent: Asterisk
Event: message-summary
Content-Type: application/simple-message-summary
Subscription-State: active
Content-Length: 92

Messages-Waiting: yes
Message-Account: sip:asterisk@172.26.5.55
Voice-Message: 1/0 (0/0)

<<<<<< Msg #49 / Packet #6800: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK0f3a1a54;rport=5060
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=a95a7c59
From: "asterisk"<sip:asterisk@172.26.5.55>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 103 NOTIFY
User-Agent: 3CXPhone 5.0.14900.0
Content-Length: 0


<<<<<< Msg #50 / Packet #14387: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-4a37e3544336b519-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 5 REGISTER
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="3f32c36b",uri="sip:172.26.5.55:5060",response="a1a942704fb3c33b74e85c3dda94b254",algorithm=MD5
Content-Length: 0


<<<<<< Msg #51 / Packet #14389: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-4a37e3544336b519-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as67b6eee8
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 5 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="180424f0"
Content-Length: 0


<<<<<< Msg #52 / Packet #14404: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
REGISTER sip:172.26.5.55:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-362b1c33f94b6904-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 6 REGISTER
Expires: 120
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="180424f0",uri="sip:172.26.5.55:5060",response="b779d6059f7931781498254285a508e6",algorithm=MD5
Content-Length: 0


<<<<<< Msg #53 / Packet #14406: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>
OPTIONS sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK549a8a6d;rport
Max-Forwards: 70
From: "asterisk" <sip:asterisk@172.26.5.55>;tag=as094165e7
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
Contact: <sip:asterisk@172.26.5.55>
Call-ID: 28b6ea0d480aaef328229e2415173809@172.26.5.55
CSeq: 102 OPTIONS
User-Agent: Asterisk
Date: Fri, 10 Feb 2012 05:58:41 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0


<<<<<< Msg #54 / Packet #14408: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-362b1c33f94b6904-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=e969144d
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as67b6eee8
Call-ID: NzQ2ZmNhZWY3YjQ2ZWE5ZTEwYzQ4MWMzYzZkOGU5NzY.
CSeq: 6 REGISTER
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 60
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;expires=60
Date: Fri, 10 Feb 2012 05:58:41 GMT
Content-Length: 0


<<<<<< Msg #55 / Packet #14410: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
SUBSCRIBE sip:asterisk@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-5861822bbb228044-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 6 SUBSCRIBE
Expires: 60
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="44a00fa5",uri="sip:asterisk@172.26.5.55",response="ce80b8cf9a3288a1364ac9d8926f809c",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<< Msg #56 / Packet #14411: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-5861822bbb228044-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 6 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="03b4a075", stale=true
Content-Length: 0


<<<<<< Msg #57 / Packet #14431: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK549a8a6d;rport=5060
Contact: <sip:192.168.44.4:57515>
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=1b03b206
From: "asterisk"<sip:asterisk@172.26.5.55>;tag=as094165e7
Call-ID: 28b6ea0d480aaef328229e2415173809@172.26.5.55
CSeq: 102 OPTIONS
Accept: application/sdp
Accept-Language: en
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Supported: replaces
Allow-Events: presence, message-summary, tunnel-info
Content-Length: 0


<<<<<< Msg #58 / Packet #14432: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
SUBSCRIBE sip:asterisk@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-a831ff4b0419a10f-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 7 SUBSCRIBE
Expires: 60
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="03b4a075",uri="sip:asterisk@172.26.5.55",response="1e22fbdbf7bcb6ac19b86fed12e3f9f3",algorithm=MD5
Event: message-summary
Content-Length: 0


<<<<<< Msg #59 / Packet #14433: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-a831ff4b0419a10f-1---d8754z-;received=192.168.44.4;rport=57515
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a95a7c59
To: "Khan"<sip:5801@172.26.5.55:5060>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 7 SUBSCRIBE
Server: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 60
Contact: <sip:asterisk@172.26.5.55>;expires=60
Content-Length: 0


<<<<<< Msg #60 / Packet #14434: 172.26.5.55:5060 --> 192.168.44.4:57515 >>>>>>
NOTIFY sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK0f3a1a54;rport
Max-Forwards: 70
Route: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
From: "asterisk" <sip:asterisk@172.26.5.55>;tag=as2db341b8
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=a95a7c59
Contact: <sip:asterisk@172.26.5.55>
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 104 NOTIFY
User-Agent: Asterisk
Event: message-summary
Content-Type: application/simple-message-summary
Subscription-State: active
Content-Length: 92

Messages-Waiting: yes
Message-Account: sip:asterisk@172.26.5.55
Voice-Message: 1/0 (0/0)

<<<<<< Msg #61 / Packet #14449: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.26.5.55:5060;branch=z9hG4bK0f3a1a54;rport=5060
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>;tag=a95a7c59
From: "asterisk"<sip:asterisk@172.26.5.55>;tag=as2db341b8
Call-ID: MTA5YTU4YzMzNzUyOTRlYjQyMjg1MmIzNGIwZWI1NGY.
CSeq: 104 NOTIFY
User-Agent: 3CXPhone 5.0.14900.0
Content-Length: 0


<<<<<< Msg #62 / Packet #17120: 192.168.44.4:57515 --> 172.26.5.55:5060 >>>>>>
BYE sip:991@172.26.5.55 SIP/2.0
Via: SIP/2.0/UDP 192.168.44.4:57515;branch=z9hG4bK-d8754z-d917fb24982e607a-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548>
To: <sip:991@172.26.5.55:5060>;tag=as7eb1068a
From: "Khan"<sip:5801@172.26.5.55:5060>;tag=a7416a2a
Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ.
CSeq: 3 BYE
User-Agent: 3CXPhone 5.0.14900.0
Authorization: Digest username="5801",realm="asterisk",nonce="7e25ea7b",uri="sip:991@172.26.5.55",response="5d9b3318cc045556657fac4e003f4a99",algorithm=MD5
Content-Length: 0

What is your specific problem?

We don’t know how little you know, so don’t know in how much detail to explain the trace, but, in any case, there is probably too much in the trace of anyone to take the time to explain it all for free.

You need to group messages by Call-ID. You have 9 different Call-IDs.
3 Call-IDs which end in @172.26.5.55 are originated by asterisk and in your case are OPTION requests caused by the presence of the qualify option in the device definition.
The rest are mostly SUBSBSCRIBE/REGISTER transactions originated by your softphone.
There is also one actual call:

Call-ID: NTkwNzgxNDU0MDY5NTEzNTZkMThhMTJlMzQ4YjA0ZWQ. #25: INVITE sip:991@172.26.5.55:5060 SIP/2.0 #26: SIP/2.0 401 Unauthorized #27: ACK sip:991@172.26.5.55:5060 SIP/2.0 #28: INVITE sip:991@172.26.5.55:5060 SIP/2.0 #29: SIP/2.0 100 Trying #30: SIP/2.0 200 OK #33: ACK sip:991@172.26.5.55 SIP/2.0 #36: INFO sip:5801@192.168.44.4:57515;rinstance=1db281adaf85c548 SIP/2.0 #37: SIP/2.0 415 Unsupported Media Type #62: BYE sip:991@172.26.5.55 SIP/2.0