Re: RTPEngine and branch_route

David,

I'm having exact the same setup with different type of clients behind
Kamailio.

I'm using approach like

modparam("rtpengine", "extra_id_pv", "$avp(via_branch_extra_id)")

...
$avp(via_branch_extra_id) = "srtp"; # For one type of clients
...
$avp(via_branch_extra_id) = "dtls"; # For other type of clients
...
rtpengine_manage("... via-branch=extra")
....
So, basically relying not on Via branch, but client type.

Maybe this will give a hint

Le jeu. 7 août 2025 à 03:07, David Tek via sr-users <
[email protected]> a écrit :

> Hello,
>
> Using Kamailio 6.0.2.
>
> I'm running a registrar that can fork incoming calls to two or more
> registered users. Some users are WebRTC and others are not, so RTPEngine
> needs to handle them differently.
>
> In the branch route, I call:
> rtpengine_manage("via-branch=auto replace-origin");
>
> However, the via-branch passed to RTPEngine doesn't match the branch ID
> of the actual INVITEs sent out.
>
> When one branch answers, the others get a CANCEL, but the CANCEL/200 OK
> sent to RTPEngine includes a different via-branch than the one used for
> the original INVITE. This causes media handling issues.
>
> I saw that the docs suggest using $T_branch(name) or AVPs to set the
> correct branch name, but $T_branch(name) seems deprecated or removed.
>
> In previous setups, branching was done on a separate instance, so
> identifying the right branch was easier. Now that it's local, I’m unsure
> how to arm rtpengine_manage() with the correct via-branch.
>
> *TL;DR:*
> When doing local forking, how can I set the correct via-branch value for
> each leg in rtpengine_manage()?
>
> Thanks,
> David
>
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-- 
Best regards,
Ihor (Igor)

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