[asterisk-users] G.729 and Voicemail

[Kevin P. Fleming]

Gordon Henderson wrote:

> All deskphnoes I've ever bought support g729 natively. They also all 
> support G711. The wholesale termination services I use all support g729 
> too. The only fly in the oinkment is local PSTN connections which are 
> obviously g711a. Now if voicemail would just blindly store in the incoming 
> format, then that would be nice - VM files would be stored in g729 or 
> g711, or whatever else comes in. It's just data afterall - why even think 
> about transcoding? (Although I'm sure the answer will be something to do 
> with trying to play g729, etc. attachments from an email or switching 
> codecs mid-call from playing the prompts to playing the message)

You missed my point; let's say a call comes in over your PSTN
connection, goes to voicemail, and they leave a voicemail, in G.711a
format. Then, one of your internal users places a call to the voicemail
system from their G.729 phone to retrieve their messages; now for that
message to be played back, it must be sent to the phone in G.729 format,
because that's what format the phone and Asterisk chose when the call
was placed.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kpfleming at digium.com
Check us out at www.digium.com & www.asterisk.org