Hello Kamailio Community,
I am currently using *Kamailio v6.0.3* as an IMS SIP core integrated with a
5G core network, and I would like to ask a question regarding *voicemail
service* integration using *iFC* (initial filter criteria).
The below is my deployment overview:
- Kamailio is deployed as *three separated IMS roles*, each running in
its own K8s pod: P-CSCF, S-CSCF, and I-CSCF.
- The configuration files are largely based on the following Open5GS IMS
examples:
- P-CSCF:
https://github.com/herlesupreeth/docker_open5gs/blob/master/pcscf/kamailio_pcscf.cfg
- S-CSCF:
https://github.com/herlesupreeth/docker_open5gs/blob/master/scscf/kamailio_scscf.cfg
- I-CSCF:
https://github.com/herlesupreeth/docker_open5gs/blob/master/icscf/kamailio_icscf.cfg
- A third-party Application Server, *Asterisk*, is deployed in a
separate K8s pod and is intended to act as a voicemail server.
The target behavior is a typical IMS voicemail scenario:
1. UE A calls UE B.
2. If UE B rejects the call or is unreachable (e.g. the SIP response
code as 486 Busy Here, 480 Temporarily Unavailable, etc.), the call should
be forwarded to the voicemail server (Asterisk), allowing UE A to leave a
voice message.
Originally, I planned to rely on *iFC in the S-CSCF* to trigger forwarding
to the voicemail application server. However, from my understanding of the
current *ims_isc* implementation in Kamailio, iFC trigger points are
evaluated only on the initial request context (method, header, session
case, etc.), and do not support conditions based on SIP response status
codes returned from the UE.
My questions are therefore:
1. Is my understanding correct that, in Kamailio v6.0.3, iFC cannot be
triggered conditionally based on the SIP response codes (e.g. 486/480/408)
received from the terminating UE?
2. If this functionality is not supported, is there a recommended or
existing method within Kamailio IMS to forward calls to a voicemail server
(such as Asterisk) when the terminating UE fails?
I would appreciate any clarification or references to existing
implementations or best practices.
Thank you very much for your time and for the continued development of
Kamailio.
--
Best regards,
Ethan
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