[OpenSIPS-Users] Dialog contact not updating until answer

[Callum Guy]

Hi All,

I've observed a behaviour (OpenSIPs 3.2.4) where the contact stored
against an active dialog is not populated until the call is answered.

Using opensips-cli dlg_list I see the following:

Ringing - https://gist.github.com/spacetourist/2502f6b76a95bb2f500fda5291e1c93b
Answered - https://gist.github.com/spacetourist/81b9e19de14a04aeff7f1f7b8965e2e5

During ringing we have:
- "state": 2
- CALLEES > "callee_contact": "",

Once answered we have:
- "state": 4
- CALLEES > "callee_contact": "sip:b2o80qss at 77.95.114.132:45656;transport=ws",

This is problematic for me as I'm working on a system to prevent
duplicate registrations from an AoR (sip:6190051 at sk-1.rtc.sip.net)
whilst preventing other instances from overruling and taking ownership
of the session by blocking registrations from separate contacts when a
call is ongoing.

The exact scenario where I'm currently seeing errors is when an active
contact (i.e. sip:b2o80qss at 77.95.114.132:45656;transport=ws) issues a
re-REGISTER during call setup. I use get_dialogs_by_profile() in
OpenSIPs to track sessions against the AoR and loop through any active
dialogs associated whenever a call or registration comes in. Using
this approach has allowed me to block other devices from creating a
second registration however the lookup is currently failing during the
ringing part of the session as the contact cannot be checked.

Is there a reason why callee_contact cannot be updated immediately
when the session begins? Is this to accommodate branching or similar?
I'll review alternative approaches whilst awaiting a reply however it
would be great if there was a path for me to solve this issue with my
current approach!

Thanks,

Callum

P.S. if this makes more sense as a Github issue then please let me
know, I'm not sure where is best to ask!

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