[Asterisk-Users] Canreinvite=???

[Eric Wieling]

The KEY thing you are missing is that IAX does NOT use RTP for audio. 
IAX uses IAX for audio and IAX for signaling.  You CANNOT "reinvite"
between a SIP/RTP endpoint and an IAX endpoint.

Since SIP, H323, MGCP, and SCCP/Skinny all use RTP for audio, in theory
you could do RTP reinvites between these protocols.  I have no idea if
Asterisk supports this or not.

On Sat, 2004-09-18 at 00:52, Carlos Arnt wrote:
> Looking at this explanation :
> "When SIP initiates the call, the INVITE message contains the information 
> on where to send the media streams. Asterisk uses itself as the end-points 
> of media streams when setting up the call. Once the call has been accepted, 
> Asterisk sends another (re)INVITE message to the clients with the 
> information necessary to have the two clients send the media streams 
> directly to each other."
> 
> So if i really understand this using this option i can make the RTP packets 
> flow from one device to another when they connect leaving only the SIP to 
> asterisk .
> So for example if then I put my Grandstream with a real ip address and use 
> * with a real ip address i can make my calls from nufone flow direct to my 
> grandstream leaving my * bandwidth free .
> 
> Like this :
> 
> Grandstream begin call ----SIP---> Asterisk |
>                                                                 | -----> 
> Nufone.
> 
> Open RTP Channel
> 
> Grandstream Real IP <------> Nufone IP
> 
> Right ??
> If i'm right , i try this and with tcpdump see the even with everyone using 
> real ip's, the RTP still going over asterisk using my bandwidth .
> (Note, I force grandstream to use the same codec then Nufone, G729)
> 
> Can someone give-me some light ?? ;)
> Can i make this ??? Use asterisk only to begin the call and let the RTP 
> flow over the client and nufone network ??
> 
> Thanks alot !
> 
> Carlos.
> 
> 
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
-- 
          Eric Wieling * BTEL Consulting * 504-899-1387 x2111
"In a related story, the IRS has recently ruled that the cost of Windows
upgrades can NOT be deducted as a gambling loss."