[Freeswitch-users] G722 8000 vs 16000

[Brian West]

> i want to use G.722 with its wide audio bandwith of 7kHz.
> But i have found that FreeSwitch resamples always from 16000 to 8000
> Samples/s if i connect a "standard device", i. e. a SIP device with a
> "G722:9/8000" in its SDP.
>
> On the other side it is possible to use full bandwith if there is a
> "G722:9/16000" in SDP.
>
> I think this is not correct!
> FreeSwitch should always use 16000S/s and also use "G722:9/8000" in  
> SDP!
>
> Read RFC3551, 4.5.2:
> ...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 and must remain
>    unchanged for backward compatibility.
> ...
>

You won't get any argument from me on this.  We do advertise  
G722/8000 and G722/16000 but in all reality G722/16000 should be  
moved up to the dynamic range.

/b