Transcoding in Lync and CUCM scenario

Hi Guys,
I am reading the blog below and find some point is quiet confusing,
blog.unplugthepbx.com/2011/04/11/integrating-microsoft-lync-and-cisco-unified-communication-manager-part-4-remote-site-scenario/
One of the goals that the author tries to achieve is:
"A voice call from Lync to Cisco across the WAN should be RTAudio across the WAN and be converted to G711 at the mediation server in the site with the Cisco phone"
I am wondering the call flow based on it, from the article it suggests:
Lync (local)-----mediation (local)-----WAN------(remote) mediation(transcodes RTAudio to G711)-------cisco phone (????).
But when the call comes out of the remote mediation server, how can it reach to the remote cisco phone?
I myself think the call flow should be like below:
Lync (local)-----mediation (local)-----WAN------CUCM-----(remote) cisco voice gateway---phone. But if it is the case, where the transcoding happens???
Can someone please give any advise, thanks.
Regards
Jim

If all you want to do is to ensure RTAudio is used on the WAN, then go ahead and put mediation servers in each site. However, if your ultimate goal is to reduce WAN utilization, then there's a better way (but it is relatively complex).
You don't really need to deploy mediation servers at each site to get calls to transcode to Cisco. Lync clients are able to talk directly to Cisco using G.711, avoiding the need for transcoding at all, and you can keep the majority of calls off the
WAN by using Media Bypass.
The way I typically do things with CUCM with remote ISRs is setup trunks to each ISR (one each for Chicago, New York and Detroit), and use media bypass to keep most of your voice traffic off the WAN.
Make sure you've configured all your subnets in Lync and assigned them to sites
Create a PSTN gateway pointing to your CUCM. This will handle signalling.
Create trunks off the PSTN gateway for each of the ISRs, using different ports. Set each trunk's
RepresentativeMediaIP to the IP address of the ISR. This ensures that media bypass will work at each site.
In Lync, set the trunks to use Media Bypass
For call routing, you have two options:
5a) Setup standard voice policies for each location to use the ISR in that location for all calls and assign them to your users (works great if everybody typically stays in one place)
5b) Use location-based routing to ensure that calls will route out the local ISR no matter where the user is currently sitting. Fairly easy to setup, but hard to manage and troubleshoot because its all done in Powershell.
With a bit of fiddling, you can ensure that all PSTN calls and Lync-Cisco calls within the local site will route out the local ISR, avoiding the WAN entirely. Inter-site routing gets a bit more complicated, but if you really want to minimize bandwidth,
you can transcode calls to use G.729 via Cisco for the most efficient bandwidth utilization. This does come at a cost of increased processor utilization on your ISR and potentially reduced call quality with all the transcoding, however.
Doing it this way does take more work, but if your ultimate goal is to reduce voice utilization of the WAN, I encourage you to check it out.
Ken Lasko | Lync MVP | UCKen.blogspot.com |
LyncOptimizer.com

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Can not foward into voicemail from outside call on CUE and CUCM 8.6

Dear Team,
I have CUE Utility and CUCM 8.6.
I can call from local, if user busy or go out office then call will foward to voice mail.It is ok.
But when i call from outside to my phone(direct line), then call can not foward to voice mail on CUE.
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Message was edited by:
Sanjo Eapen

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