I am going to soon be doing a major phone network redesign for one my clients that has 8 locations. The main office has a UCM6510 and each remote office has a UCM6204. They are all interconnected via VPNs and have ext to ext calling and LDAP sync working fine.
The current design has each phone connected to their local UCM.
The redesign will see each phone connected to the main office 6510. There are good reasons for this to take place.
In a fail-over situation the plan is to have each phone connect back to their local UCM. Inbound call fail-over at the ITSP level will route inbound calls to the correct UCM depending on the main site’s status.Each local UCM can also make outbound calls, etc.
Each extension will maintain their current extension number.
Now my question relates as to how best to handle the phone fail-over.
My current thinking is to handle fail over by:
Creating the same extension number, authID and SIP password for phone on both the main and local UCMs
In AccountX -> General Settings set the SIP server to the main office’s UCM IP and the Secondary SIP Server to the local office’s UCM IP
My thinking is that when the main office UCM is up, the phones will connect to the UCM defined as the SIP Server. When the main office UCM is not reachable, the phones will connect to the UCM defined as the Secondary SIP Server. When the main office UCM becomes reachable again, the phone will switch back. Since the credentials are the same, the phone should be able to log into each UCM without issue.
So my questions are:
Will this work?
What have I missed or not considered?
Thanks for your support.