The customer has one cluster callmanager deployed with two callmanager servers over the WAN. However, there is only one unity server(UM) installed at head office. On remote site where has one subscriber and voice gateway installed, all the inbound calls are going to unity AA and transferred to extensions of remote site(no DIDs). It also has SRST configured on this voice gateway.
For this deployment, we have the problems for the inbound calls during WAN outage but subscriber callmanager server still up: all the inbound calls will get fast busy because the subscriber callmanager can not reach the Unity server for AA and the SRST is not kicked in because all the remote site phones are still registered to the subscriber callmanager.
We tried to find a good solution for this scenario during wan down but subscriber up, we know that shutdown the subscriber at remote site is one of the solutions for SRST to work. But during wan outage, to access subscriber server from head office is also hard.
A cluster consists of a set of Cisco CallManager servers that share the same database and resources. You can configure the servers in a cluster in various ways to perform the following functions:
Database publisher server:
Application software server
Primary call-processing server
Backup call-processing server
When you install the Cisco CallManager software on servers, you specify which servers and which Cisco CallManagers belong to the same cluster. You also specify which server performs which function for the cluster. You can dedicate a particular server to one function or combine several functions on one server, depending on the size of your system and the level of redundancy you want.
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