[OpenSIPS-Users] AVP availability in CANCEL

[Callum Guy]

Hi All,

I have a simple question regarding availability of AVP variables in CANCEL.
I'm not sure when OpenSIPs will load the AVP's for a transaction so am
looking for information here. The situation is that I want to flag sessions
using a media proxy and close the sessions when a CANCEL arrives before the
call is answered.

This is how I enable and track rtpengine:

route[RTPENGINE_OFFER_IE] {
  set_dlg_flag(10);
  $avp(media_proxy) := "on";
  rtpengine_offer("trust-address replace-session-connection
in-iface=internal out-iface=external ICE=remove");
}

The current logic sets both a dialog variable and an AVP when rtpengine is
offered. When BYE/CANCEL messages arrive the script does this:

if (is_method("BYE|CANCEL")) {
  match_dialog();
  if (is_dlg_flag_set(10) || $avp(media_proxy) == "on") {
    rtpengine_delete();
  }
}

I was hoping that the dialog would be matched by call ID and tags however
this does not appear to work so I must be missing some info. The AVP was
added later to try and make it work for the CANCEL requests but also did
not work.

I'm planning on replacing the AVP with a transaction flag tonight, is that
likely to resolve the issue? Apologies if these are basic questions,
availability of different types of flags and AVP's really aren't clear to
me so any advice would be appreciated!

Thanks,

Callum

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