Replace session name in sdp

[Alberto]

Hi,

I'm using the latest rtpengine and opensips 3.2

is there an option to replace the session name, s= line?
This is usually the same as the useragent, but I'm replacing the useragent using opensips, and would like to replace the s= line accordingly.

Thanks

[Richard Fuchs]

No we don't have such an option. Your best bet is probably to do it from
your SIP proxy, e.g. through the sdpops module or so. Or submit a patch
as pull request 👍

Cheers

[Alberto]

I tried to do it in opensips, using

replace_body_all("^s=.*$", "s=abczzz");

This works if I don't use rtpengine.

When I add all the rtpengine offer/answer functions, the s= line is reverted to the original.

I tried to do replace_body_all before and after the rtpengine_offer, but it doesn't seem to have any effect.

[Richard Fuchs]

On 23/03/2022 13.41, [EXT] Alberto wrote:
> I tried to do it in opensips, using
> replace_body_all("^s=.*$", "s=abczzz");
> This works if I don't use rtpengine.
>
> When I add all the rtpengine offer/answer functions, the s= line is
> reverted to the original.
> I tried to do replace_body_all before and after the rtpengine_offer,
> but it doesn't seem to have any effect.

I don't know about OpenSIPS but with Kamailio you have to use
msg_apply_changes() when you do something like this.

Cheers

[Alberto]

There's no such option in opensips.

It might be a bug in opensips that rtpengine is supplied with the original body instead of the modified version.

I'll check with them as well.

Thanks.

[H R]

The option is described here
https://opensips.org/docs/modules/3.2.x/rtpengine.html#idp5728112