Re: AST_FRAME_DIGITAL

Kevin P. Fleming schrieb:
> Klaus Darilion wrote:
> 
>> What about adding AST_FORMAT_H223 to rtp.c too?
This way we could 
>> forward H223 to other Asterisk Boxes doing the
demux and video stuff.
> 
> This is not useful unless a channel driver that uses
RTP can
> send/receive H.223 (which means there must be a means
of negotiating
> this format with other endpoints, in the case of SIP
that means there
> must be support in SDP for H.223 media stream
negotiation).


I thought this is rather simple - just adding
AST_FORMAT_H223 to rtp.c. 
We only have to agree on the name in the a=rtmap line.

klaus

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Klaus Darilion wrote:
> 
> Kevin P. Fleming schrieb:
>> Klaus Darilion wrote:
>>
>>> What about adding AST_FORMAT_H223 to rtp.c too?
This way we could 
>>> forward H223 to other Asterisk Boxes doing the
demux and video stuff.
>> This is not useful unless a channel driver that
uses RTP can
>> send/receive H.223 (which means there must be a
means of negotiating
>> this format with other endpoints, in the case of
SIP that means there
>> must be support in SDP for H.223 media stream
negotiation).
> 
> 
> I thought this is rather simple - just adding
AST_FORMAT_H223 to rtp.c. 
> We only have to agree on the name in the a=rtmap line.
> 
> klaus
> 

Have you considered CLEARMODE as defined in RFC 4040?
I found a pcap sample in Wireshark wikipedia:

     A sample of H.223 running over RTP, following
negotiation over SIP.
     http://wiki.
wireshark.org/SampleCaptures

Mikael

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Klaus Darilion wrote:

> I thought this is rather simple - just adding
AST_FORMAT_H223 to rtp.c. 
> We only have to agree on the name in the a=rtmap line.

That is only true if the SDP for H.223 media streams is very
simple
(takes no parameters, especially optional ones), and if the
SDP required
parameters (format names and such) are already defined
somewhere. Just
telling the RTP module that the format exists is not enough
to actually
handle calls.

'We' don't get to agree on the name in the rtpmap line...
it's defined
by RFCs or other standards.

-- 
Kevin P. Fleming
Director of Software Technologies
Digium, Inc. - "The Genuine Asterisk Experience"
(TM)

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