[asterisk-bugs] [JIRA] (ASTERISK-30142) Missing port in Contact header in response to incoming requests

[Morten Sølvberg (JIRA)]

Morten Sølvberg created ASTERISK-30142:
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             Summary: Missing port in Contact header in response to incoming requests
                 Key: ASTERISK-30142
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30142
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 18.12.1
         Environment: Debian Bullseye
            Reporter: Morten Sølvberg


I have recently updated all our tenants from v. 18.0.1 to 18.12.1, and I see behaviour that I haven't encountered before.
When receiving incoming INVITEs, then the Contact header reported in the 183 and 200 OK responses does not contain the TCP listening port. 
For one tenant I use the TCP port 5118, but when the Contact header does not contain that specific port, then the remote party sends the ACK and subsequent BYE to port 5060 - which I am not iistening on.
If I enable rewrite_contact on the Endpoint that receives the INVITE, then suddenly the port appears - however not sure why..

Please note that all outbound INVITES and OPTIONS are sent with the correct port in the Contact header - regardless of whether contact_rewrite is enabled for the endpoint.

I am quite certain that I haven't seen this behaviour prior to the upgrade to v. 18.12.1. 
Just FYI: In same upgrade I also updated the Debian version from Buster to Bullseye, but I can't see how this would affect Asterisk.

It is not a major issue for me, if I can trust that enabling rewrite_contatct for all endpoints will cause Asterisk to include the listening port in the Contact header, but I would really like to know why.

Is this a known bug/change or could it be a configuration issue?

Just FYI: I do not REGISTER at the remote host.
For the transport I use the below configuration:

[transport-tcp]
type=transport
protocol=tcp
bind=0.0.0.0:5118
tos=cs3
cos=3
allow_reload=true
external_media_address=52.166.13.xxx
external_signaling_address=52.166.13.xxx
local_net=10.0.0.0/8
local_net=172.16.0.0/12
local_net=192.168.0.0/16



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