[asterisk-users] Help with Codes and Polycom Phones

[David Klaverstyn]

Hi All,

This may be an off topic but I'm not sure who else would know the answer. I'm playing around with Asterisk and Polycom phones.  I see Polycom supports quite a few codec.  The usual ones and these:

G722

Siren14.24kbps                 Siren22.32kbps
Siren14.32kbps                 Siren22.48kbps
Siren14.48kbps                 Siren22.64kbps

G7221.16kbps                    G7221_C.24kbps
G7221.24kbps                    G7221_C.32kbps
G7221.32kbps                    G7221_C.48kbps


I can get Asterisk to work with G722 and the sound is superior compared to uLAW. I tried to get it working with Siren7 and Siren14 but I cannot.  It always says incompatible codec and what is this Siren14 and Siren22 with Polycom.  Is this different to Asterisk's Siren7 and Siren14?  Is this why I cannot get Siren to function?

siren7 show version        : Digium Siren7 Module Version 1.8.0_1.0.5 (optimized for barcelona_64)
siren14 show version     : Digium Siren14 Module Version 1.8.0_1.0.5 (optimized for barcelona_64)

I found this document : http://www.polycom.com/global/documents/whitepapers/codecs_white_paper.pdf which is quite good.
It sais:
G.722.1. Also known as "Siren 7"
G.722.1 Annex C. Also known as "Siren14"

This doesn't explain why the Polycom    G7221_C doesn't work with Asterisk's Siren14
G.722.1 doesn't work with Asterisk's Siren7

Am I just doing something wrong?  Is my understand correct?

So what is Siren14 and Siren22 on the Polycom handsets?  What does that match to in Asterisk?


Regards
David Klaverstyn



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