I would like to add an AASTRA MX-ONE Telephony Switch (formerly Ericsson) as a H.323 gw to a Cisco Unified Call Manager 6.1.2. Unfortunatelly this does not work for me. I can make calls from an Ericsson phone to a Cisco IP Phone. The IP Phone rings a few times and then the connection terminates. The opposite direction does not work at all.
Can anyone share some experience about CUCM - Ericsson H.323 interoperability?