Does pjsip can add contact header on ack packet like chan_sip?
Details in below picture (red rectangle)
There’s nothing explicitly in chan_pjsip doing this, so it would be down to the PJSIP stack as to whether it would or not.
As far as I can tell, from a quick read of the RFC, a contact header in an ACK would serve no useful purpose. Although they are allowed, there is no case where they should be included, let alone ones where they must.
I suspect that you are dealing with a peer that is using Contact for purposes for which it wasn’t intended.
Thank you very much
But the remote peer only see trunk is up when we send those contact header on ACK “200 OK” packet
The SIP message you provided is actually a 200 OK response, not an ACK. We most certainly place a Contact header in those for calls. You’re doing an OPTIONS though there and not a call. I don’t see why we’d place one in it, since there’s no ACK.
I think the OP was trying to show what a Contact header looked like.
Ah yeah, potentially.
You are rigth. It’s “200 OK” reponse we sent to other peer for OPTION method
It does not currently add a Contact header. According to the RFC we should, so please file an issue.
Are you sure the RFC says it should. They only part that I found on this said it should on target refresh requests, but it also said that ACKs were not target refresh requests, unless I misread it.
The example response to an OPTIONS included the Contact header, so I just went off of that. I looked closer in my no longer half asleep state and it states this:
Contact header fields MAY be present in a 200 (OK) response and have the same semantics as in a 3xx response.
Good old MAY. So, it may or may not be present I guess.
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