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T37 onramp fax with Unity and exchange on separate servers

Hi group,

I've a setup, Unity 5.x in failover mode with two exchange servers 2003 SP2, which are not part or exchange cluster. I've kept 50% of user's mailboxes on 1 server and rest on another.

Now, I' need to configure T37 onramp fax to allow inbound faxing for few of the users.

I read few docs and looking for some help in clarifying the following. This is from "Unity IP Fax Inbound Gateway Configuration Example.pdf" document ID: 63423. The commands are required on gateway:

1) mta send server port 25

>>> Which IP Address this would be, Unity or exchange? Should I put multiple statements for the second server i.e. Unity failover node/Second exchange??

2) Inside the mmoip dial-peer "session target"

>>>> Is this required for each and every user having mail-boxes to receive incoming faxes or it'll be the subscriber in unity which I would dedicate to receive all the inbound faxes.?

Thanks in advance...