Lync 2010 and Cisco UCM 10.x integration questions

We are adding a new CUCM 10 cluster at three new IP addresses. I need to make sure that our Lync conference calling continues to work when we cut over to the new cluster. To permit conference calls from the new cluster would it simple mean adding a new Pool with IP address of the new publisher? The config on the Cisco side is the same for the SIP trunking to Lync.
amigan_99Network EngineerAsked:
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Mohammed HamadaSenior IT ConsultantCommented:
Lync Conferencing works regardless of the CUCM unless you're talking about the PSTN calls that are coming through to the Lync Conferencing. It all depends on how you are configuring Lync for incoming or outgoing calls...

Is Lync dependent on Cisco for PSTN calls? If so then I doubt that Lync conferencing will be affected either case if you're not removing the already existing CUCM from Lync?
amigan_99Network EngineerAuthor Commented:
Well the situation is this: I have two phones registered on the new cluster. I replicated the trunk from the old CUCM cluster to the new CUCM cluster. So they go to the same IP, the same port number, same everything. But, when I dial from a phone reg'd on the new cluster, I get a fast busy rather than the expected "Welcome to the Audio Conferencing Center". My current link client users can dial PSTN from the client but it's not really needed. The important thing is to be able to get from new cluster to the Lync audio conferencing.

I think the issue is that the members of the new cluster are not listed as PSTN gateways nor associated with the lync mediation server. That's how I was able to get the communication between CUCM and Exchange Unified Messaging working - by adding them as new UM IP Gateways. ??
Mohammed HamadaSenior IT ConsultantCommented:
You must add the new CUCM to your Lync PSTN topology, publish the topology and configure the trunk and pstn routes with the new IPs as well.

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amigan_99Network EngineerAuthor Commented:
Yep - that did it. Once the new member pstn gateways were added then concalls could be initiated from the CUCM 10 phones.  Thanks.
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