[Asterisk-video] H320

[John Martin]

>>
>>> So it could be great to have it integrated into asterisk, so we  
>>> could offer
>>> a full IP(SIP,H323)-ISDN(H320)-UMTS(H324M) gateway. And make  
>>> everything
>>> work with meetme conferences :)
>>
>> I'd kill for that!!
>>
>To be a bit more civilized ;-)
>- Does anyone want to contribute funding for development
>of this?

We would be more interested in doing the work than funding it. We could
provide some elements of what is already needed and might look for a
royalty per system, like G.729 is done, because of that. If there were
enough funding then we could forgo the royalty.

>- Does anyone have development resources that can create this solution?
>

If there were enough funding, we could do this.

>To be a bit more technical:
>- How much do we need to change libpri?

Clear data channels would need to be presented to the chan_h320. This
may already be available. Don't forget chan_misdn as another means of
getting at ISDN.

>- How much do we need to change zaptel?

Clear data channels would need to be presented to the chan_h320. This
may already be available.

>- How much do we need to change the PBX core?

There shouldn't be too much needed here. All the resynchronisation of
the multiple B channels is handled in the bonding code.

>- How do we transcode to SIP phones?
>

The same way that H.323 does... we sync/source G.7xx frames and H.26x
frames. Any H.320 code would have to concern itself with padding of the
B-channels up to the total bandwidth needed, and to strip padding from
the H.320 media streams to provide a variable bitrate stream for SIP and
H.323. It gets a bit messy when the SIP or H.323 burst over their
allowed bandwidth (as some do), but on the whole that should be
manageable.

>And legal:
>- Are there any patents standing in the way?
>

Not to my knowledge. There's still the usual H.263 issue but as long as
we're not actually encoding then that wouldn't apply.

/O_______________________________________________
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