[Asterisk-video] help for videocall

[Sergio Garcia Murillo]

On Fri, 2008-02-22 at 15:35 +0100, Klaus Darilion wrote:
> 
> barbara_b02 at libero.it wrote:
> > Hi list,
> > first of all: sorry for my bad english...
> > I'm new to Asterisk world... I'm using Asterisk-1.4.13 on Debian distribution.
> > I've tested with success loopback, mp4play, mp4save and IVR calling Asterisk with a 3G mobile phone.
> > Now I'm trying a 3G<->sip videocall (using a NEC-phone and X-lite running on Windows) but I think I'm confused about how to do this... I've read the mailing list archive, the pages on VoIP-info and the instructions on Fontventa but I don't understand how to write my dialplan, especially the order of the following exten...
> > 
> > - h324m_gw()
> > - h324m_gw_answer()     
> > - h324m_call()
> > - Dial()     
> > 
> > I found contradictory configuration examples reading the archive...
> > 
> > And do I need the following exten?
> > 
> > exten => dial,1,Set(CHANNEL(transfercapability)=VIDEO)
> > exten => dial,n,NoOp(transfer=${CHANNEL(transfercapability)})
> > exten => dial,n,Set(CHANNEL(userinformationlayer1)=38)
> > exten => dial,n,NoOp(ul1=${CHANNEL(userinformationlayer1)})
> 
> This is needed for SIP-->3G calls (to make 3G video signalling in ISDN 
> SETUP message), but not needed for 3G-->SIP calls.
> 
> To bridge 3G-->SIP calls:
> 1. Make sure to have AMR codec installed (and configured codecs.conf -> 
> see readme from AMR codec)
> 
> 2. in sip.conf allow videocalls and active h263p for the SIP peer
> 
> 3. MAke proper bandwidth settings in XLITE/eyebeam:
>    deactivate the "zero touch bandwidth detection" and then in the 
> advanced section set the bandwidth to "DSL, Cable".
> 

Xlite will probably send too much video bitrate so probably you'll see
video lagging and delaying from audio. In this case use app_transcode to
reencode the video to the correct bitrate. 

Best regards 
Sergio