[asterisk-users] Realtime, ODBC Voicemail, and multiple asterisk servers?

[Damon Estep]

I have seen a very small number of posts on this type of setup;

 

1. mysql replicated failover cluster (Linux HA) for the realtime
databases and ODBC voicemail storage

2. multiple asterisk servers (~4) connected to the SAME realtime tables
and VM store.

3. Any defined SIP client connected to any server in the group.

 

Has anyone had extensive experience with this?

 

Are there caveats?

 

What about SIP realtime caching being required for MWI, if a SIP peer
registers with one server, then later registers with another server, SIP
realtime caching could be an issue, unless of course the registrations
come from the same port (if behind NAT) and address, which is not likely
in cases where the SIP users are behind various NATs.

 

Is there a way around SIP realtime caching that results in functional
MWI?

 

If a call comes in via SIP to server 1, and the user is registered on
server 2, what happens? You would assume that the call would complete,
but does that SIP user now get cached on the originating server as well
as the registration server?

 

If the VM is stored in the DB then there should not be an issue leaving
VM on any server, since they are all looking at the same mailbox content
in the DB anyways.

 

Does ODBC VM store user recorded prompts in the database as well, or
just VM messages? Could be an issue with prompts not being the same on
all servers if they are still stored locally.

 

Any information on this type of setup appreciated.

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