SIP register based on REGXML? How can i do that?

Hey,

i have an door intercom system, it contains a private SIP perotocol for the indoor station… on that specific indoor station we can also register extra indoor stations as extensions…
so what happens, if i press the doorbutton (intercom) , the first indoor station rings, and then also forwards the call to the other indoor stations

I did a wireshark trace, how this works, and seems the extensions that register on indoor station, are sending some extra XML header stuff…
I wanted to try this with a softphone, but it failed, with a 501 ‘not implemented’ error, probably because i’m not sending the XML stuff…

I wanted to setup asterisk/freepbx,to register a SIP trunk on it, so i can forward the calls, or maybe another approach ??

But how can i send extra XML ?

see below how the extension is beging registered on the indoor panel, you see some imortant xml stuff, also below is the 501 error when i do it from a softphone

thnx in advance

############ Indoor extension Protocol SIP/XML ######################################################################

10000000002@192.168.0.72:5060;line=39b237d1561ac46>
Authorization: Digest username="10000000002", realm="Hikvision", nonce="710ae2f3adf7446b6ea068ed6cede929", uri="sip:10000000002@192.168.0.71:5065", response="78e1b60cb438905bdaf010e680d06734", algorithm=MD5, opaque="9c77d2882f5d8f3fb72f307e3da4d76d"
Content-Type: text/xml
Max-Forwards: 70
User-Agent: eXosip/3.6.0
Expires: 900
Content-Length:   165

<regXML>
<version>V2.0.0</version>
<regDevName>Room 2</regDevName>
<regDevSerial>XXXXXX</regDevSerial>
<regDevMacAddr>xxx</regDevMacAddr>
</regXML>
REGISTER sip:10000000002@192.168.0.71:5065 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.72:5060;rport;branch=z9hG4bK870856495
From: Room 2 <sip:10000000002@192.168.0.72>;tag=588337480
To: Room 2 <sip:10000000002@192.168.0.72>
Call-ID: 1549082696
CSeq: 2 REGISTER
Contact: <sip:10000000002@192.168.0.72:5060;line=39b237d1561ac46>
Authorization: Digest username="10000000002", realm="Hikvision", nonce="710ae2f3adf7446b6ea068ed6cede929", uri="sip:10000000002@192.168.0.71:5065", response="78e1b60cb438905bdaf010e680d06734", algorithm=MD5, opaque="9c77d2882f5d8f3fb72f307e3da4d76d"
Content-Type: text/xml
Max-Forwards: 70
User-Agent: eXosip/3.6.0
Expires: 900
Content-Length:   165

<regXML>
<version>V2.0.0</version>
<regDevName>Room 2</regDevName>
<regDevSerial>XXXXX</regDevSerial>
<regDevMacAddr>xxxx</regDevMacAddr>
</regXML>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.0.72:5060;rport=5060;branch=z9hG4bK870856495
From: Room 2 <sip:10000000002@192.168.0.72>;tag=588337480
To: Room 2 <sip:10000000002@192.168.0.72>;tag=111615696
Call-ID: 1549082696
CSeq: 2 REGISTER
Content-Type: text/xml
User-Agent: sipServer
Date: Thu, 16 Sep 2021 17:46:27 GMT
Content-Length:    70

<version>V2.0.0</version>
<random>r4yRs3RdrvLb3I7hUO+qDQ==</random>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.0.72:5060;rport=5060;branch=z9hG4bK870856495
From: Room 2 <sip:10000000002@192.168.0.72>;tag=588337480
To: Room 2 <sip:10000000002@192.168.0.72>;tag=111615696
Call-ID: 1549082696
CSeq: 2 REGISTER
Content-Type: text/xml
User-Agent: sipServer
Date: Thu, 16 Sep 2021 17:46:27 GMT
Content-Length:    70

<version>V2.0.0</version>
<random>r4yRs3RdrvLb3I7hUO+qDQ==</random>

############ Softphone Protocol SIP ######################################################################

REGISTER sip:192.168.0.71:5065 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.197:37969;branch=z9hG4bKSadsZg7XVO0mMlX2;rport
Contact: <sip:10000000002@192.168.0.197:37969;rinstance=8EBC221E>;expires=600;video
Max-Forwards: 70
From: <sip:10000000002@192.168.0.71:5065>;tag=A46D171175C26A4438D151F4BE0E4520
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: replaces, path
To: <sip:10000000002@192.168.0.71:5065>
Expires: 600
Call-ID: B72DE525A93DC0365BCC3981C749BC97848B17BC
CSeq: 1546 REGISTER
User-Agent: Softphone/5.4.9 (build 1648221; Android 11; arm64-v8a)
Content-Length: 0

REGISTER sip:192.168.0.71:5065 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.197:37969;branch=z9hG4bKSadsZg7XVO0mMlX2;rport=37969
From: <sip:10000000002@192.168.0.71:5065>;tag=A46D171175C26A4438D151F4BE0E4520
To: <sip:10000000002@192.168.0.71:5065>
Call-ID: B72DE525A93DC0365BCC3981C749BC97848B17BC
CSeq: 1546 REGISTER
Contact: <sip:10000000002@192.168.0.197:37969;rinstance=8EBC221E>;expires=600;video
Allow: ACK
Allow: BYE
Allow: CANCEL
Allow: INFO
Allow: INVITE
Allow: NOTIFY
Allow: OPTIONS
Allow: REFER
Max-forwards: 70
Supported: replaces
Supported: path
Expires: 600
User-agent: Softphone/5.4.9 (build 1648221; Android 11; arm64-v8a)
Content-Length: 0

SIP/2.0 501 Not Implemented
Via: SIP/2.0/UDP 192.168.0.197:37969;branch=z9hG4bKSadsZg7XVO0mMlX2;rport=5065;received=192.168.0.71
Contact: <sip:10000000002@192.168.0.197:37969>
From: <sip:10000000002@192.168.0.71:5065>;tag=A46D171175C26A4438D151F4BE0E4520
Call-ID: B72DE525A93DC0365BCC3981C749BC97848B17BC
CSeq: 1546 REGISTER
To: <sip:10000000002@192.168.0.71:5065>
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: replaces, path
User-Agent: Softphone/5.4.9 (build 1648221; Android 11; arm64-v8a)
Content-Length: 0

REGISTER sip:192.168.0.71:5065 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.197:37969;branch=z9hG4bKSadsZg7XVO0mMlX2;rport
Contact: <sip:10000000002@192.168.0.197:37969;rinstance=8EBC221E>;expires=600;video
Max-Forwards: 70
From: <sip:10000000002@192.168.0.71:5065>;tag=A46D171175C26A4438D151F4BE0E4520
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: replaces, path
To: <sip:10000000002@192.168.0.71:5065>
Expires: 600
Call-ID: B72DE525A93DC0365BCC3981C749BC97848B17BC
CSeq: 1546 REGISTER
User-Agent: Softphone/5.4.9 (build 1648221; Android 11; arm64-v8a)
Content-Length: 0

There is no support for receiving or sending this information.