IPCC express HA Mode

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Nov 1st, 2006
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I read in the SRND guide that IPCC servers (2) in HA mode must be in the same location as each other and callmanagers. as long as all servers have IP connectivity can they be in seperate locations?

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mmelbourne Wed, 11/01/2006 - 16:36
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This is an interesting question. The answer I obtained from Cisco, was that HA (at least in the 4.0 release) provides only server-level redundancy and not network redundancy, and that the both servers needed to be in the same location, and connected to the same switch. Apparently even Layer 2 connectivity across a GigE connection is not supported because some failure could partition the network, potentially resulting in two Masters and consequential loss of synchronisation.

wesley_lim Fri, 11/03/2006 - 20:56
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Matthew, that is indeed odd. And perhaps that is also the answer I am looking for. I am working on a HA CRS installation and finding some difficulty in activating the secondary server.

Chris Deren Wed, 05/09/2007 - 19:45
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    2017 IP Telephony, Contact Center, Unified Communications

Check out page 3-3 of IPCCX SRND:


When designing an IPCC Express deployment, the following rules apply:

? The CRS Engines and Databases components must be co-located in the same building with the CallManager servers running the CTI Managers with which IPCC Express will be communicating. Other CallManager nodes within the same CallManager cluster (if this is a CallManager cluster split over the WAN) can be located on other VLANs.

? CRS Engine and Database components must be co-located on the same VLAN.

? When deploying High Availability (HA), the CRS Engine and Database components must both be redundant and collocated in the same building.

? If recording is going to be used for a HA deployment, then the Recording component must be redundant.

? All agents for an IPCC Express deployment must be using phones which register to the same CallManager cluster. Calls can be received from devices and callers on another CallManager cluster (using inter-cluster trunks).




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