[cisco-voip] Moving to G729 - Transcoder Questions

[STEVEN CASPER]

Thanks! So would this be the proper IOS configlet for the dspfarm profiles?
 
 dspfarm profile 2 transcode
 codec g711ulaw
 codec g729ar8
 maximum sessions 8
 associate application SCCP
!
dspfarm profile 1 conference
 codec g711ulaw
 maximum sessions 8
 associate application SCCP 

>>> "Scott Voll" <svoll.voip at gmail.com> 12/20/2007 2:06 PM >>>
As Griag stated, if the device supports G729 that won't be a problem.
 
the only time it becomes a problem is when you have apps like UCCx that only support G711.  then you need a transcoder next to that app.
 
We are setup like you.  G711 at central site (CM, VGW, Apps, etc) and G729 at remote sites.  I have Transcoding resources at the central site so if they want to use the apps, they can.  I also have Conferenece resources at the central site so that if one party is at the remote site they get a G729 stream while everyone else gets G711. 
 
So if you don't have apps that only support G711 you really don't need Transcoding.  And personally A one point before transcoding resources I just had them call out the PSTN to our helpdesk which gets you around the G711 issue but in cures Toll charges. 
 
Scott

On Dec 20, 2007 10:44 AM, Craig Staffin <cmstaffin at gmail.com> wrote:


Steven,

Unity can support G729 as well as all of your endpoints and gateways.

The only time a transcoder would be needed is if you had a call start as G711 and then get transfered over the WAN thus needing to get transcoded from G711 to G729  This usually only happens during a conference call. 

As far as your long distance calls they will simply get setup as a G729 call to begin with therefor no need for transcoders.

Craig

On Dec 20, 2007 12:34 PM, STEVEN CASPER < SCASPER at mtb.com> wrote:


 We have been using G711 to our branches for IPT and I am now looking at using G729. I am confused as to my transcoder requirements. I would think I would need to provision DSP based transcoder resources at the remote locations and also at the central location so G729 would always be used across the WAN. I think that transcoding resources would be required at both the remote location and the central location for the following scenarios across the WAN link: 
 
Calls to a centralized Unity
Calls to centralized PRI gateways for Long distance calling 
Calls to/from  IP phones at G711 locations?
Conferencing IP phones and an analog or digital trunk 
 
Does this look correct? For some reason determining when a transcoder is required is proving to be hard for me to grasp. Are there any other scenarios where transcoding would be required?
 
Thanks!
Steve
 
 
 
 


Steve Casper
Voice Technologies
M&T Bank
(410) 347-6026 
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Craig Staffin 
Craig at staffin.org 
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