asterisk users - Apr 2005 - SIP / PTT over Cellular

Hi Stefan!

1. You also have to modify the RTP channel, as floor control will be 
done using RTCP.

2. The biggest problem is the lack of compatible hand sets. There are 
several standards (Nokia, Ercisson, OMA..) and it is hard to find 
working handset.

regards,
Klaus

Stefan Gofferje wrote:
> Hi folks!
> 
> I have been reading a lot and I found out that PTT over Cellular is 
> based on VoIP, precisely SIP. Does anyone here knows if Asterisk's 
> chan_sip understands the cellular SIP?
> Vodafone Germany has turned down PoC after a testing phase and I would 
> too much like to have my own PoC Server for me and my friends.
> 
> Regards,
> Stefan
>

On Tue, 2005-04-05 at 11:08 +0200, Stefan Gofferje
wrote:
> Hi folks!
> 
> I have been reading a lot and I found out that PTT over Cellular is 
> based on VoIP, precisely SIP. Does anyone here knows if Asterisk's 
> chan_sip understands the cellular SIP?
> Vodafone Germany has turned down PoC after a testing phase and I would 
> too much like to have my own PoC Server for me and my friends.
Some PTT systems are not Voip like Altell, Orange, and other small
carriers.
They use voice channels and sms to setup call info and maintain
available state information.
The system used is kodiaknetworks.com
> 
> Regards,
> Stefan
> 
-- 
respectfully, Joseph ==============---------------------= **********  =