[Asterisk-Dev] help needed implementing H324M (UMTS Video)

[Klaus Darilion]

Steve Underwood wrote:

> Klaus Darilion wrote:
> 
>>
>>
>> Paul Cadach wrote:
>>
>>> Hello,
>>>
>>> Klaus Darilion wrote:
>>> [skip]
>>>
>>>> I'm yet not sure were to put the gateway - the strange thing is that
>>>> H.324 are 2 calls in one. There is at first the call to setup a data
>>>> channel - e.g. on ISDN a B channel will be setup using Q931 
>>>> signaling in
>>>> the D channel. After the B channel is established, H.245 will be used
>>>> setup the video call).
>>>
>>>
>>>
>>>
>>> There is B-channel bonding to expand single video call to 128Kbps. 
>>> First call just set up framing (H.223) and
>>> signalling(H.245??) then originating endpoint makes second call with 
>>> H.223 framing and bond both calls (read - two
>>> B-channels each with own H.223 framing) into single "big" channel 
>>> with single H.245 multiplexed over two H.223 channels.
>>
>>
>>
>> Hi Paul!
>>
>> Are you sure about the bonding? I've went through the standards and 
>> bonding was never mentioned.
>>
>> regards,
>> klaus
> 
> 
> When you want more than 64K in an ISDN call, you ask for it as you set 
> up the call. There is a "bearer transfer mode" field, which lets you ask 
> for various quantities of 64K circuits. Obviously, for a BRI only 64K or 
> 2x64K make any sense.
> 

In all the specs I read only a 64K bearer is requests, so I guess one 
B-channel will be necessary for a video call.

regards,
klaus