[cisco-voip] Moving to G729

Wed Jan 23 09:34:12 EST 2008

>>> "STEVEN CASPER" <SCASPER at mtb.com> 1/23/2008 8:34 AM >>>
Setting up a G729 site I notice under voice class codec or the voip dial-peer config I can only select:

G729r8 or g729br8

Under the conference or transcoder profiles I can select all variations of g729:
   g729abr8  G.729ab 8000 bps
   g729ar8    G.729a 8000 bps
   g729br8    G.729b 8000 bps
   g729r8     G.729 8000 bps 

 Does this mean I can only use g729 or g729ab across the WAN?

Steve

>>> "zohaib shabir" <zohaibshabir at gmail.com> 12/21/2007 8:17 AM >>>
Steve,
I have been using G.729a in production in  two different setups(one of them is two years old) and never had Voice Quality issues with Call Manager. I have used in both CCM 4.0,4.2 and Voice gateway 2621XM, 3845 and AS 5400XM. As far as my experience is concerned no problems in Cisco G.729.

On Dec 21, 2007 6:05 PM, STEVEN CASPER <SCASPER at mtb.com> wrote:

Thanks to all for your feedback. One more question/comment - Our experiences in the past using g729 have not been positive. Last time we tried to use it was back in the Nortel days using ITG cards and 9150 remote office devices. Our biggest problem was complaints on a lack of fidelity overall and distortion of higher frequency female and elderly voices.  We have not tried this yet in production using Cisco, I am hoping there has been some improvement. The potential cost reduction on overall bandwidth costs makes it hard to resist. 

Steve

>>> "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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