[asterisk-dev] AST_FRAME_DIGITAL

[Klaus Darilion]

Thus, to summarize:

I see two options for adding digital/3G video types to Asterisk:

1. AST_FORMAT_H223. This will only be used if the incoming call is 
digital AND signals H.223&H.245.

+ with this option it is for sure that the digital call is a 3G video call
- there is no standardized way to forward this to other Asterisk server
- does not help us handling other non-3G-video calls

2. AST_FORMAT_CLEARMODE. This will be used for any incoming digital 
call. Thus, from the frametype it is not deriveable which application is 
inside the CLEARMODE.

+ by adding CLEARMODE to rtp.c we have a standard conform way to forward 
digital calls to other Asterisk servers
+ more generic and flexible
- requires a little bit more dialplan logic to detect 3G video calls

Thus, is there a chance to get AST_FORMAT_CLEARMODE into Asterisk (which 
I would prefer instead of AST_FORMAT_H223)?

regards
klaus

Klaus Darilion schrieb:
> funny: similar discussion (without useful result)
> 
> regards
> klaus
> 
> Mikael Magnusson schrieb:
>> 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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