Re: Kamailio WSS to Asterisk (UDP) MESSAGE Handling Issue

Maybe this will give you some ideas:

https://github.com/silentindark/kamailio-private-public_wss/blob/master/kamailio.cfg

It’s what I used a few years back, should still be valid.

Regards,

David Villasmil
email: [email protected]



On Fri, Jul 11, 2025 at 10:29 AM Fernando Lopes via sr-users <
[email protected]> wrote:

> Hello everyone,
>
> I'm running into a problem with SIP traffic coming in over WSS to
> Kamailio. As far as I know, Kamailio can't forward traffic to Asterisk over
> TLS, so I'm currently using UDP to send traffic from Kamailio to Asterisk
> via the dispatcher module.
> The main SIP methods involved are REGISTER and MESSAGE. Kamailio
> successfully receives and forwards both methods to Asterisk, though I’m not
> entirely sure how the message routing is working behind the scenes — but
> somehow, it works.
> The problem arises when Asterisk sends a response to a MESSAGE. In my
> Asterisk logs, I can see that the response is being generated, but it seems
> to get lost or mishandled when Kamailio tries to process or forward it.
>
> To clarify the setup:
> ->Kamailio is listening on 10.5.0.8:5001 (WSS)
> ->It forwards traffic to Asterisk at 10.5.0.2:5060 (UDP)
> ->The issue specifically happens with MESSAGE replies, not REGISTER
> I suspect this might have something to do with mismatched transport
> protocols (WSS vs. UDP) or incorrect handling of routing headers in
> Kamailio. Any insights on how to debug or fix this properly would be
> greatly appreciated!
>
> Thanks in advance.
>
> My Code:
>
> https://docs.google.com/document/d/e/2PACX-1vSpRQmgZv1CTJW4IJ86a3SoSgPqmThMSmmpWWjXfwC0pZCp7mos-4QmNnW9uDC3dR9B66UL3Re4AX9z/pub
>
> Logs:
> <--- Transmitting SIP request (560 bytes) to UDP:10.5.0.8:5001 --->
> MESSAGE sip:[email protected]:5001;transport=ws;x-ast SIP/2.0
> Via: SIP/2.0/UDP 10.5.0.2:5060
> ;rport;branch=z9hG4bKPj8d3db1ed-d98e-4c87-ad71-ef43f47b1801
> From: "Max" <sip:[email protected]>;tag=ae0b9d4d-89b9-489a-b5ef-3fb04fe6dd97
> To: "ChatApp Max" <sip:[email protected];x-ast>
> Contact: <sip:[email protected]:5060>
> Call-ID: 0ea7b15e-f176-452a-813d-684b01923c87
> CSeq: 24741 MESSAGE
> Max-Forwards: 70
> User-Agent: Asterisk PBX 18.24.3
> Content-Type: text/plain
> Content-Length:    74
> Compreendo, por favor, avança com a tua pergunta. Estou aqui para ajudar.
> <--- Received SIP response (480 bytes) from UDP:10.5.0.8:5001 --->
> SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)
> Via: SIP/2.0/UDP 10.5.0.2:5060
> ;rport=5060;branch=z9hG4bKPj8d3db1ed-d98e-4c87-ad71-ef43f47b1801;received=10.5.0.2
> From: "Max" <sip:[email protected]>;tag=ae0b9d4d-89b9-489a-b5ef-3fb04fe6dd97
> To: "ChatApp Max" <sip:[email protected]
> ;x-ast>;tag=19162a7003f0e5d10acb0ff84f0e52ca.d3fdd014
> Call-ID: 0ea7b15e-f176-452a-813d-684b01923c87
> CSeq: 24741 MESSAGE
> Server: kamailio (5.7.6 (x86_64/linux))
> Content-Length: 0
> <--- Received SIP response (463 bytes) from UDP:10.5.0.8:5001 --->
> SIP/2.0 500 Message processing error (2/TM)
> Via: SIP/2.0/UDP 10.5.0.2:5060
> ;rport=5060;branch=z9hG4bKPj8d3db1ed-d98e-4c87-ad71-ef43f47b1801;received=10.5.0.2
> From: "Max" <sip:[email protected]>;tag=ae0b9d4d-89b9-489a-b5ef-3fb04fe6dd97
> To: "ChatApp Max" <sip:[email protected]
> ;x-ast>;tag=0e4dcc88f47817a0f29d34cc60c5db67-d3fdd014
> Call-ID: 0ea7b15e-f176-452a-813d-684b01923c87
> CSeq: 24741 MESSAGE
> Server: kamailio (5.7.6 (x86_64/linux))
> Content-Length: 0
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