ReInvite sent after ACK with same SDP using PJSIP

Hello Everyone,

I currently manage over 100 Asterisk boxes and started the process of moving them to Asterisk 16 with PJSIP.

I have been testing the implementation with a number of SIP Providers. During outgoing calls, I have noticed that Asterisk sends multiple re-invites after 200 OK. This is not something we have seen happening before and its not something I am familiar with.

What I find strange is that the re-INVITE contains the same SDP and message body as the original INVITE. Moreover, one of our providers requires us to fix this.

I have researched the documentation and have been unable to find any reference to this behavior. Has anyone encountered this before please or am I missing something?

Thank you in advance.

Gordon

There are two open issues[1][2] for this. If you ensure that the endpoint is limited to the supported codecs then it may resolve the issue immediately.

[1] https://issues.asterisk.org/jira/browse/ASTERISK-28871
[2] https://issues.asterisk.org/jira/browse/ASTERISK-28634

Thank you so much! Reducing codecs only to the supported ones has mitigated the issue.