Asterisk Calls Dropping

Asterisk
1

We are seeing calls dropping from our carrier on a routine basis. We have determined with the help of our carrier that the contact header has an altered IP address of a location in Germany. This is the packet that my provider is receiving on their end.

SIP/2.0 200 OKindent preformatted text by 4 spaces
Via: SIP/2.0/UDP ‘IP HOP EXCLUDED’:5060;branch=z9hG4bK847c.1572dcf.0;received='SIPPROVIDERIP’
Via: SIP/2.0/UDP ‘IP HOP EXCLUDED>’:5060;branch=z9hG4bK02b3b9c4-a539-4ba3-a633-0f000fc3f671_6772d868_13720248625149
Record-Route: 'sip:‘IP EXCLUDED’:5060;lr;ftag=48033898_6772d868_02b3b9c4-a539-4ba3-a633-0f000fc3f671’
From: <sip:+1XXXXXXXXXX@‘MY SIP PROVIDER DOMAIN HERE’;isup-oli=62>;tag=48033898_6772d868_02b3b9c4-a539-4ba3-a633-0f000fc3f671
To: <sip:+18668453118@‘MY IP PBX HERE’;user=phone>;tag=as454525fb
Call-ID: d3be42f696205634271add6a6d4a1a4f@0.0.0.0
CSeq: 8900 INVITE
Server: Asterisk PBX 11.21.2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Contact: sip:+1XXXXXXXXXX@'GERMAN IP ADDRESS HERE’
Content-Type: application/sdp
Content-Length: 242

v=0
o=root 1679205374 1679205374 IN IP4 'MY IP HERE’
s=Asterisk PBX 11.21.2
c=IN IP4 'MY IP HERE’
t=0 0
m=audio 10396 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv



I have verified at my edge that the contact header I am sending is the correct ip of my pbx.  Can someone outline how or why the packet my carrier receives is the German IP?`indent preformatted text by 4 spaces`
2

Please edit your posting to use unformatted text (</> button). Currently you have an empty Contact header according to what I can see.

Damaged Contact headers are likely to be router problems. Disable any SIPALG option and configure Asterisk directly for NAT traversal.

3

Ok I for some reason couldn’t figure out how to implement the </> correctly? (Sunday morning no coffee yet). But I did manage to show that area now.

4

Where are you based?
Your asterisk box has a public ip or is it behind a nat?

5

That particular server is located in Virginia and so is my service carrier.

6

Check if your phones use stun server.

7

We do not have any STUN servers in our path.

8

My Asterisk box has a public ip

9

How do they know that it is a German IP? Did you make a reverse lookup to see where it leads?