[cisco-voip] Conference with remote resource using G.729

[Ryan Ratliff]

Is it a true MTP or a transcoder?  Hardware transcoders register with  
a device name of MTP<mac addr> but there is a huge difference in  
functionality between the two.  A true MTP can only use one codec.  A  
transcoder is able to talk multiple codecs.   In the CCMAdmin does  
this hw MTP device show up under Transcoders or MTP?  A hardware MTP  
is a pretty good waste of DSP resources IMHO since a transcoder can  
do everything an MTP can do and more.

-Ryan

On May 16, 2006, at 7:11 AM, Robin H wrote:

Hi Ryan,

There is a hardware MTP in hq. Can I use it to do transcoding so that
when hq phone1 initiate the conference and then invite site1 phone,
site1 phone will still use G729 codec instead of G.711? If yes, what
is the region that I should use for the MTP in hq.

thanks,
Robin

On 5/16/06, Ryan Ratliff <rratliff at cisco.com> wrote:
> The CM software CFB only supports g.711.  If your conference is
> actually being established at g.711 then somebody has most likely
> placed your CFBs in a region that is set to do g.711 to all other
> regions.  Otherwise you would have never been able to get the
> conference established.
>
> Your options are a transcoder or hardware conference bridge.
>
> -Ryan
>
> On May 15, 2006, at 11:48 AM, Robin H wrote:
>
> I have CallManager server at hq site and a WAN/Voice router in branch
> office (site1). Site1 phones are using conference and transcoding
> resource from CallManager. When I made a call from hq to Site1 (it
> uses G729 for VoIP over WAN) and then initiate conference from hq
> phone to outside, the conference can be established but it uses G711
> for both hq and site1 phone. Is there a way I can force the site1
> phone to use G729 even when in conference to save WAN bandwidth? I
> read about transcoding feature is to save WAN bandwidth. In this case
> How can I use it for site1 phones? Thanks
>
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