[asterisk-dev] Asterisk application and SIP channel

[Olle E. Johansson]

28 jan 2010 kl. 15.51 skrev Russell Bryant:

> On 01/28/2010 02:18 AM, nedo nodo wrote:
>> I'm new of Asterisk. I'm studying how improve an application of Asterisk
>> (app_konference). Now I need a lot of RTP information like audio/video
>> ports, ip address etc. The application receive from Asterisk only
>> ast_channel data structure that doesn't contain RTP information. How can I
>> retrieve these information?
> 
> Strictly speaking, this violates Asterisk architecture.  Applications 
> are supposed to work independently of what channel type is in use. 
> However, there is one interface that could be extended to provide the 
> information you need.  Take a look at the CHANNEL() function defined in 
> funcs/func_channel.c.  Through this dialplan function, channel drivers 
> can provide channel type specific information.  chan_sip already 
> provides a number of things.  You could extend it to suit your needs and 
> execute CHANNEL() from the application.

Agreed.

The question here is why you need RTP information in app_konference. We're a multiprotocol PBX and non-RTP protocols also support video (like IAX2). It's better to try to stick to the multiprotocol approach as long as you can and avoid protocol-specific features in applications.

/O