[asterisk-users] Asterisk G722

SIP sip at arcdiv.com
Thu Feb 7 13:03:41 CST 2008


 From the RFC:

"Even though the actual sampling rate for G.722 audio is 16,000 Hz, the 
RTP clock rate for the G722 payload format is 8,000 Hz because that 
value was erroneously assigned in RFC 1890 
<http://www.faqs.org/rfcs/rfc1890.html> and must remain unchanged for 
backward compatibility. The octet rate or sample-pair rate is 8,000 Hz."



Thomas Kenyon wrote:
> Kevin P. Fleming wrote:
>   
>> zoa wrote:
>>     
>>> Asterisk does not support that yet.
>>>       
>> Yes it does, and it puts G.722 into the SDP the way that RFC3551
>> specifies. To the original poster: please read RFC3551 and you will
>> understand why G.722 appears in the SDP with an 8000 sample rate instead
>> of 16000.
>>
>>     
> Is it (from vague memory) because G.722 @ 16Khz is called G722/8000 ?
>
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