[cisco-voip] Moving to G729 - Transcoder Questions

[Scott Voll]

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
> (H) 262-437-7313
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