[cisco-voip] Moving to G729 - Transcoder Questions

Sat Dec 22 12:33:10 EST 2007

Well, there is an issue with g729 and MOH, cuz the codec was designed
for voice, the quality for music tends to be a bit poor... though I
have never noticed a problem...

Jonathan

On Dec 21, 2007 7:17 AM, zohaib shabir <zohaibshabir at gmail.com> wrote:
> 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
> > > >
> > > > ************************************
> > > > This email may contain privileged and/or confidential information that
> is intended solely for the use of the addressee. If you are not the intended
> recipient or entity, you are strictly prohibited from disclosing, copying,
> distributing or using any of the information contained in the transmission.
> If you received this communication in error, please contact the sender
> immediately and destroy the material in its entirety, whether electronic or
> hard copy. This communication may contain nonpublic personal information
> about consumers subject to the restrictions of the Gramm-Leach-Bliley Act
> and the Sarbanes-Oxley Act. You may not directly or indirectly reuse or
> disclose such information for any purpose other than to provide the services
> for which you are receiving the information.
> > > > There are risks associated with the use of electronic transmission.
> The sender of this information does not control the method of transmittal or
> service providers and assumes no duty or obligation for the security,
> receipt, or third party interception of this transmission.
> > > > ************************************
> > > >
> > > > _______________________________________________
> > > > cisco-voip mailing list
> > > > cisco-voip at puck.nether.net
> > > > https://puck.nether.net/mailman/listinfo/cisco-voip
> > > >
> > >
> > >
> > >
> > > --
> > > Craig Staffin
> > > Craig at staffin.org
> > > (H) 262-437-7313
> > > (C) 262-613-6003
> > > _______________________________________________
> > > cisco-voip mailing list
> > > cisco-voip at puck.nether.net
> > > https://puck.nether.net/mailman/listinfo/cisco-voip
> > >
> >
> >
> >
> > ************************************
> > This email may contain privileged and/or confidential information that is
> intended solely for the use of the addressee. If you are not the intended
> recipient or entity, you are strictly prohibited from disclosing, copying,
> distributing or using any of the information contained in the transmission.
> If you received this communication in error, please contact the sender
> immediately and destroy the material in its entirety, whether electronic or
> hard copy. This communication may contain nonpublic personal information
> about consumers subject to the restrictions of the Gramm-Leach-Bliley Act
> and the Sarbanes-Oxley Act. You may not directly or indirectly reuse or
> disclose such information for any purpose other than to provide the services
> for which you are receiving the information.
> > There are risks associated with the use of electronic transmission. The
> sender of this information does not control the method of transmittal or
> service providers and assumes no duty or obligation for the security,
> receipt, or third party interception of this transmission.
> > ************************************
> >
> > _______________________________________________
> > cisco-voip mailing list
> > cisco-voip at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-voip
> >
>
>
>
> --
> Regards,
> Zohaib Shabir
> Network Engineer(Voice)
> DWP Group, TECH Division Karachi
> Ph:+92-302-8232689
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>