The voicemail system you're referring to is more than likely using an inband-DTMF over analog lines type of interface to the PBX, which is not supported by Cisco UCM.

Hello,unfortunately, we don't have any hands-on experience with the NEC 2000, as we don't have one in our lab.  I'm assuming you're using ab ISDN PRI trunk to connect the UC500 to the NEC PBX. If that's the case, the best way to troubleshoot this pro...

Hello,I can't decipher that trace, and therefore cannot see what's going on with your failed outbound calls from CUCM to the Avaya PBX. I suggest you contact our TAC group, if you haven't done so already, so that someone may look at the trace and be ...

Hello,please refer to this document:http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/pbx/interop/notes/430317av.pdfEven though the software version on CUCM is older, and the note was written for the newer Avaya S8500 platform, the application note...

Hello,currently, there are no plans to perform interoperability testing with MetaSwitch products, as we don't have any in-house. We do actively perform interoperability testing with Service Providers SIP solutions/offerings; if one of the SP's we pla...