I have connect a interface E&m on 2600 router with e e&m on a Ericsson pabx.
When i place a call from pabx to router all is good.
When i place e call from router to pabx the phone recive the call but before a ring the conversasion down. Why ?
See if the configuration tip on a similary discussion on the forum helps you.
Be sure that the type of e&m interface of the Ericsson pabx is really compatible with e&m cisco.
If e&m ercisson is type V - Bristh Telecom, forget it, You'll not be able to put it working correctly