[SR-Users] How to msg_apply_changes in a branch route?

[Daniel-Constantin Mierla]

Hello,

at this moment, msg_apply_changes() works before the transaction is
created. Transaction itself is rather big structure and handling it is
done with a complex state machine (lifetime timers, retransmissions,
callbacks, ...). If someone wants to work on such enhancement, is more
than welcome, just make it configurable and as much as possible not
intrusive. For the moment, obviously branch processing is done in the
context of transaction.

On the other hand, if you need it in relation with rtpengine, there are
variables that you can use to set/get the sdp exchanged with rtpengine:

  *
https://www.kamailio.org/docs/modules/stable/modules/rtpengine.html#rtpengine.p.read_sdp_pv

Then you can change what is returned and use set_body().

Cheers,
Daniel

On 01.12.20 09:36, Anthony Alba wrote:
> Is there a way to obtain the effect of msg_apply_changes in a branch route?
>
> I want to do:
>
> route[BRANCHMANAGE] {
>
> rtpengine_manage()
> msg_apply_changes()
>  // further mangle the SDP with textops for
> // obtuse UAs
>
> }
>
> The reason for this, is that after forking, I have some UAs that are
> extremely picky about SDP, and I need to mangle the body to make them
> happy. (4000 char limit, 68 attribute limit on SDP body - ever seen
> that? Compared with the absolutely gigantic OFFERs from WebRTC
> signalling libraries...)
>
> Now rtpengine_manage() and textops are working on separate copies of
> the msg body and the results don't stack correctly.
>
> Cheers
> Anthony Alba
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla