SiteA:Call manager4.1.3<--------IPSec VPN---------->SiteB:Call Manager Express4.0(1)(on cisco1760 voice gateway)---Unity Express 2.1.3(on Cisco2650XM/w AIM-CUE).
Sympton:When the IP phones registered under Call Manager starts a call to IP phone regiestered under Call Manager Express, the call can be established but ,when the phone foward no-answer to voice mail , I cann't here the prompt of voice mail ; When we start a call from PSTN , the voice mail of the phone in CCME side can be reached and heard.
"voice service voip
allow-connections h323 to sip" command had been added in CCME router , but , It doesn't work.
All the codec are G.711u-law. Call Manager to CCME is H.323 trunk.
Can anyone told me why ? Urgent , thanks !!!