CS1000E - Can't find how to disable G.729 2

[routetehpacketz]

Hello,

This forum has been a great help for a lot of questions I've had with the Nortel CS1000E (rel. 7.6) environment I've inherited. I just wanted to thank everyone for their contributions of Nortel knowledge.

I'm trying to correct an issue we've been facing for who-knows-how-long and have finally diagnosed it as a codec negotiation issue. The gist of it is a call from the PSTN will go to our CS1000 and offer G.711u and G.729, and the CS1000 will elect to use G.729. If the call ends up transferring to voicemail (3rd party product running on a Windows VM), it is ultimately dropped since voicemail only supports G.711u and G.711a. When the PSTN sees the call handing over to voicemail, it ends up sending a SIP 415 "Unsupported Media Type" since the codec suddenly changes from G.729 to G.711.

To fix the problem, I simply want to turn off G.729 on our CS1000E. However, I'm having trouble finding where to do that.

In Element Manager, I've gone to IP Network -> Nodes: Servers, Media Cards -> VGW and Codecs and there is no checkbox next to G.729.

I've also gone into Zones and have changed all of the applicable VTRK zones to Best Quality since they were on Best Bandwidth.

What other settings on the CS1000E are related to codec selection?

 

[bignose21]

MGC config you can deselect the g729 codec for the DSPs

 

[routetehpacketz]

MGC config you can deselect the g729 codec for the DSPs

hey thanks for responding. I think I'm seeing what you're referring to. If I run the "vgwShowAll" command in Element Manager, I can see the g.729 codec listed on all of the channels, but how do I edit this?

Is this something I would edit within Element Manager? All of the MGCs are registered to a core call server, so we typically only log into one place to make changes.

 

[routetehpacketz]

ahh I finally found it in Element Manager. Under IP Network -> Media Gateway, I didn't realize the "Type" column was a list of hyperlinks (all named MGC of course). clicking on one for a particular IPMG gave me a page of settings that included codecs.

 

[hardybacon]

You have to save the change > Save the Node > Transmit the change > And restart applications most of the time.

 

[bignose21]

When you save the MGC changes it reboots the MGC

 

[routetehpacketz]

thanks, guys. when you say "transmit the change", how exactly do I go about doing that? I just went through all of our MGC/S and turned off the G.729 codec, but none of them unregistered so I'm guessing I'm missing this step.

edit: so I rebooted one of the MGCs and now when I run the vgwShowAll command it doesn't have the G.729 codec listed on its channels, but most of them are showing "n/a" instead. only two of them are showing G.711 so I'm a little concerned the others aren't going to function.

edit 2: I'm guessing the "n/a" goes away after a channel gets hit with its first call. I checked again and more channels are showing G.711, so I think we're making it somewhere. I'll reboot the rest of the MGCs and test the initial issue that prompted the removal of G.729. thanks everyone for the help!

 

[bignose21]

Hardy was meaning any changes to the Node properties, which you were not doing, you were just as you say altering the MGC settings.

Yes as the channels get used it shows the last used Codec.