I am with the following question: My remote site uses Cisco CallManager Express with E1 for PSTN and IP phones. My question is at the central site where I need to integrate the PBX with a Cisco router 2801, for best operation, which interface to use? FXS or FXO?
Below is a picture of topology to help.
If the Cisco gateway was FXS, and the PBX FXO, then the situation would be reversed:
PBX could dial any Cisco extension
Cisco could dial a preset PBX destination
All other restrictions would be the same.
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