[Freeswitch-users] proxy SDP

[Steven Ayre]

I don't mean they're equivalent, because proxy_media has other sideaffects
such as disabling many features.

I mean there are different better ways to avoid transcoding.

What you suggested with bridge should indeed avoid it. Without the
absolute_codec_string the bleg would be offered all codecs supported by FS
which may be more than supported by the caller, however with that setting it
would only offer those supported by both the caller and FS. The callee will
pick one it supports (or return 488 Not Acceptable Here). The aleg will then
use the same codec as the bleg, so at that point both legs will be using the
same codec so no transcoding will take place (unless you try using something
like eavesdrop/record). You could then if you wanted handle the 488 Not
Acceptable Here by redialing without absolute_codec_string to try again,
this time the bleg could use a different codec than the aleg (transcoding).

-Steve


On 14 April 2011 13:28, Sergey Okhapkin <sos at sokhapkin.dyndns.org> wrote:

> Do you mean
>
> set proxy_media=true
>
> is the equivalent of
>
> set late_negotiation=true
> bridge {absolute_codec_string=${ep_codec_string}}blah
>
> and transcoding will never happen?
>
> On Thursday 14 April 2011, Steven Ayre wrote:
> > Proxy media is not required for 2 NAT clients to talk to each other.
> >
> > Transcoding won't be used if both legs use the same codec, and you can
> use
> > late-negotation/absolute_codec_string to encourage that.
> >
> > -Steve
> >
> > On 14 April 2011 11:22, Sergey Okhapkin <sos at sokhapkin.dyndns.org>
> wrote:
> > > Proxy media is useful not for T38 only. It's a way for 2 NATed clients
> to
> > > communicate with each other if there are common codecs, no transcoding
> > > involved.
> > >
> > > On Thursday 14 April 2011, Steven Ayre wrote:
> > > > You misunderstand I think... it *isn't* needed for T38 any longer.
> Only
> > >
> > > in
> > >
> > > > very old versions.
> > > >
> > > > -Steve
> > > >
> > > > On 13 April 2011 23:17, Madovsky <infos at madovsky.org> wrote:
> > > > > maybe change the param name to proxy_media_t38 ;)
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Kristian Kielhofner" <kris at kriskinc.com>
> > > > > To: "FreeSWITCH Users Help" <freeswitch-users at lists.freeswitch.org
> >
> > > > > Sent: Wednesday, April 13, 2011 2:10 PM
> > > > > Subject: Re: [Freeswitch-users] proxy SDP
> > > > >
> > > > >
> > > > > Brian,
> > > > >
> > > > >  For all of the confusion proxy media creates I still see cases
> where
> > > > >
> > > > > it is useful...  It shouldn't be removed completely.
> > > > >
> > > > > On Tue, Apr 12, 2011 at 8:55 PM, Brian West <brian at freeswitch.org>
> > >
> > > wrote:
> > > > > > We aren't a proxy... we have transcended into this quasi proxy in
> > >
> > > some
> > >
> > > > > > scenarios which mostly involve t.38... as for proxy media DO NOT
> > > > > > USE IT. Just saying it might go away since the purpose of it is
> > > > > > now not needed since we have full t.38.
> > > > > >
> > > > > > Thanks,
> > > > > > Brian
> > > > >
> > > > > --
> > > > > Kristian Kielhofner
> > > > >
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