[Freeswitch-users] Not proxying session refresh INVITEs when in bypass media mode

Anthony Minessale anthony.minessale at gmail.com
Wed Apr 5 22:05:56 MSD 2017

There is

sip_ignore_reinvites channel var.

That would be the extent of what we have for that case.

On Wed, Apr 5, 2017 at 11:52 AM, Spencer Thomason <
spencer at whiteskycommunications.com> wrote:

> Hello all,
> Apologies if this is the wrong place for this type of discussion as its a
> little dev oriented.  JIRA/PR to follow once we get a little better
> direction.
> We’re interested in adding a feature to ignore (i.e. not proxy across the
> bridge) session refresh INVITEs where the SDP has not changed when in
> bypass media mode, similarly to how ReINVITEs are handled in “normal”
> mode.  So a few questions:
> - Does this already exist and I missed it?
> - Is there any recommendation on when to consider the SDP “the same” as
> the previous SDP? The scenarios I can think of where we would definitely
> need proxy the ReINVITE are T38, holds and video attribute changes.  My
> thought is to just 200 OK codec changes that keep the same connection IP
> and port to keep things simpler but I’d like some feedback here.  Are there
> other scenarios I’ve missed?
> - Where should we store the address and port for later comparison?
> SWITCH_REMOTE_MEDIA_IP_VARIABLE (remote_media_ip) and
> SWITCH_REMOTE_MEDIA_PORT_VARIABLE (remote_media_port)?  Are these only
> used for audio currently?  I see there are another set for video...
> - As we would need to parse the connection address and port in the SDP,
> what would be the preferred way?  Just use the sofia sdp parser?  Or do it
> manually?  Doing it manually might be faster but I’m sure there would be
> edge cases we would need to work out i.e. multiple c= lines, etc..  Or is
> there a “builtin” way I overlooked?
> - Has anyone tried this and are there any horror stories?
> - Does anyone have any feedback for the best user interface handles?  I.e.
> potential channel variables and/or SIP profile params?  I was thinking
> something along the lines of a param called “nomedia-ignore-refresh-invite”
> but that might be confusing and hopefully someone has a better name :-)
> Thanks!
> Spencer
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Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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