[Freeswitch-users] Grandstream

[Brian West]

I highly recommend you report this go grandstream.  I have already  
done so once and that was 6 months ago.  I can't believe this problem  
still exists.

While G722 is a 16k codec the SDP and clock should be at 8k.  This is  
due to a bug in the RFC.

RFC3551 section 4.5.2 clarifies this information.

    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.  The octet rate or sample-pair
    rate is 8,000 Hz.

Aastra also does G722 incorrectly.

Snom and Polycom  work great.

/b

On Sep 22, 2008, at 2:32 AM, jocke eriksson wrote:

> Hello Freeswitch users, I'm having some trouble with a Grandstream  
> phone of mine. Each time i try to call it up and stream a file to it  
> Freeswitch prints this
> ' Codec G722 Exists but not at the desired implementation. 16000hz  
> 20ms '. Does anybody use Granstream GXP-2000 and now how to fix it,  
> or can i modify Freeswitch to except this codec , all help is
> appreciated .
>
> Regards Jocke
>
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