[Asterisk-Users] How to configure the communication between two Asterisk servers

[Tielin Xu]

Hi All:

I have special set up to be done. See anyone can help me some ideas.
Two Asterisk servers, server A trunks to PSTN, server B works as call
routing engine.
All sip phones are registered in server B.

I have scenario like following:
1. A call comes to server A, server A sends the call related
information to server B,
    assume that uses fast AGI.
2. Server B receives the message from server A, and look up dial plan
for call routing,
3. Serve B sends the extension number back to server A, 
4. Server A routes the call to the assigned agent.

How does server B receive the message from server A?

Many thanks for your help.

Tielin Xu
CTI Analyst
Nintendo of America