[asterisk-dev] H324M Gateway

[Steve Underwood]

Sergio García Murillo wrote:

>Steve Kennedy wrote:
>  
>
>>On Tue, Apr 25, 2006 at 09:03:23PM +0800, Steve Underwood wrote:
>>
>>    
>>
>>>AMR and H.263 are both knee deep in patents.
>>>      
>>>
>>AMR definately is, the licensees charge per transcode, but with a
>>minumum volume of 10,000 at $1 a pop and $15,000 set-up. Decoding
>>only is slightly cheaper (i.e. a transcode is a single codec being
>>used to encode or decode, if you have 5 conversations going at once,
>>it's 5 transcodes i.e. 5 licenses).    
>>
>>Steve
>>    
>>
>
>Would it be just framing the gsm amr stream in covered by the transcoded license? 
>I don't know much of gsm framing, if it's fixed length or if you have to do a more in deep analisys of
>the stream to construct the rtp packet (as it would be the case of h263). 
>  
>
Do you mean analysing what comes from the handset? If so, then yes, the 
AMR bit stream between the base station and handset is very speech 
oriented, with lots of error correction on things like the MSBs of the 
frame energy, and almost no error correction for the LSBs.

>Also parsing of the h263 stream to find the gob boundaries would be considered transcoding also?
>If we could just do the framing withouth any license problems it would be more than enougth.
>You could use softphones like Eyebean that dedoce and encode both streams or use asterisk as a videomail server for example.
>  
>
Steve