Hello again,
I am not a SIP expert, and I’m new to Kamailio, really enjoying learning it,
but I’ve hit a blocker and I’m pretty sure I’ve missed something really simple.
I’m looking to implement the Redirect Server from here:
https://tools.ietf.org/html/rfc3665#section-3.6
<https://tools.ietf.org/html/rfc3665#section-3.6> (the Avaya Session Manager
being Alice), Kamailio as the Redirect Server. My configuration is working
fine, and I can see the 302 going back (to Avaya SM), I then get the ACK I’m
expecting.
The incoming SIP request contains a number of fields, including a Contact
header, which I’m told SM needs on the return. But the send_reply() or
sl_send_reply() doesn’t return the Contact header, and I am unable to manually
set it, or any other header, using any of the append_hf(), append_to_reply()
etc. mechanisms. I’m executing a msg_apply_changes() which succeeds, but no
Contact header is returned.
I’ve tried an sl_send_reply(“100”, “Trying”) before any other processing, and
Wireshark confirms that the SIP response is basically identical to the 302
response sent after processing… The goal is to run this stateless, I’m assuming
this is possible - it certainly feels like it should be.
I’ve re-read the intros & tutorials, and other reading material such as this
http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf
<http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf> but,
this, even my best Google-fu has left me utterly stumped…
The sl_send_reply documentation
https://kamailio.org/docs/modules/5.2.x/modules/sl.html#sl_send_reply
<https://kamailio.org/docs/modules/5.2.x/modules/sl.html#sl_send_reply> states
“If the code is in the range 300-399 (redirect reply), the current destination
set is appended to the reply as Contact headers” but the Contact header is
definitely not being set when I use this.
Apologies in advance if eyes are rolling and this is really obvious, or (and?)
that my lack of SIP knowledge is shining through - any tips or guidance would
be appreciated. I certainly feel overwhelmed by the number of modules and the
interplay between them.
If the answers to this, and other things along these lines are contained in the
admin book, that’s fab, I’ve just filled the form out :)
Cheers - Robert...
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