[Asterisk-Users] How to stop Asterisk from changing the SDP?

[Stian Selnes]

What I'm actually trying to do is to send video over SIP. The video
codecs I would like to use is H.261, H.262 or H.264. I can see from
typing "show codecs" in the CLI that Asterisk supports H.261 and
H.263. I guess this means that if I set Asterisk to disallow all but
these two codecs, I'm able to get the video through? But the video
stream then would go via Asterisk and not directly between the two
video applications?

On 6/16/05, steve at daviesfam.org <steve at daviesfam.org> wrote:
> 
> 
> On Thu, 16 Jun 2005, Stian Selnes wrote:
> 
> > Hi.
> >
> > Tanks for your answer. So I understand you correct if you mean that
> > there is no way to let asterisk leave the SDP untouched? I have tried
> > SER, and I just wanted to look at the possibilities that Asterisk
> > offered. A bit dissapointing that it doesn't satisfy my needs :-)
> >
> > - Stian
> 
> 
> No - for a particular application you can probably get the SDP stuff going
> out of Asterisk similar enough to the incoming for what you need.  This
> will be by adjusting the codec allows and disallows.
> 
> But Asterisk's core does not think in terms of sdp descriptors and so
> forth.  An incoming SIP invite becomes an incoming call into the Asterisk
> core, which via the dialplan may become an outgoing call to some other sip
> peer.  There's no connection between the incoming sip channel and the
> outgoing one from the point of view of the SIP channel driver.
> 
> Now I can't say whether Asterisk can satisfy your needs, seeing you didn't
> say what the needs are beyond "don't touch the SDP".  If that is really
> what you need, Asterisk as it is can't satisfy them.  But perhaps if you
> write the actual problem you are trying to solve you'll find that Asterisk
> can meet that!
> 
> Steve
> 
>