re: Call Admission Control in Lync Server 2010

bob Krangle — Wed, 15 May 2013 16:56:17 GMT

Lync Server 2010 doesn’t enforce CAC at layer 2 networking, which is managed by routers.

You have your switches and routers mixed up.

Routers = Layer 3; Switches = Layer 2.

re: Call Admission Control in Lync Server 2010

DrRez — Fri, 04 Mar 2011 01:01:03 GMT

Here's a comment that came through another route. I am also including the response from author, Subbu Chandrasekaran.

Question: How does CAC work over MPLS network?

Answer: There is a section in the planning guide that talks about CAC in MPLS network

Question: On the example Bobby initiates call to Alice and Alice's Communicator checks the call admission control policy to determine whether the call can be established. What happen with Bob, Does Bob´s Communicator check the call admission control policy to determine whether the call can be established? There are two differents links, with different bandwidth Policy, and Bob´s link over MPS can be bandwidth constrained.

Answer: The CAC server that Alice’s endpoint contacts will be able to make CAC Decision for all the links that are involved including Bob’s

Question: How does CAC work on roaming situation?

Answer: The CAC server uses the current set of IP Address from the clients to determine the following:

IPAddressess > Subnets > location of endpoints(such as NY office etc.) > determine the bandwidth capacity and the current available bandwidth.

Question: You said that Configuring call admission control involves Determining the IP subnets assigned to each network site, however I do not know how Lync use that information in order to restrict banwidth. Do you have more accurance information about this?

Answer: See above. Once the location of the client is determined, the location contains information about the total bandwidth capacity and the current bandwidth that is available when the call is being attempted. If there is bandwidth available to allow a call, then the CAC server would allow the call.