Avaya SE 9.1 SIP trunk

[abrink]

This is more of a best practice question. I have an install with this scenario:
Primary server: LAN1 is connected to the network and LAN2 is a SIP trunk
Secondary server: LAN1 is connected to the network and LAN2 is a SIP trunk

Secondary is going to be used for overflow and failover - is this possible?
I have 7 other 500v2 expansions systems - is it better to have the SIP trunks located there?
----------
I have a similar current setup and it has been one problem after another, and do not know if it is a design issue or not. The one big problem I have with the other one is when the SIP call is made to go into a conference bridge, the DTMF tones are not received correctly.

Any insight on what the best practice is would be appreciated.

[rmaser]

In regards to your "one big problem" - A few things to look at:

Do you have the very latest SP of 9.1?
What codec are you using on SIP?
What DTMF mode are you using on SIP?
Is this affecting more than one internal user?