here is my problem. we have a cme/unity express router in a remote office. when we call (4 digit dial) a number the call traverses our WAN connection. if the called party doesnt pick up the call gets dropped. its supposed to go to voice mail. one question i have is. would our Call manager in the home office have any involvment in this issue. If the called party doesnt pickup is it the Home office CM's responsibility to reroute to Unity Ex. or should CME reroute the call to UEX? hope this is clear
My guess is that this is a codec issue in the CME. Have a look;
Codecs and Transcoding
Cisco Unity Express supports only G.711 voice streams, so all calls made into the system (including those from IP phones, PSTN gateway ports and any other VoIP equipment in your network) must use G.711 if they enter the AA or voice mail pilot numbers that terminate on Cisco Unity Express.
If you require that G.729A calls traverse IP segments of your network between sites, and that these calls forward or dial direct into Cisco Unity Express AA or voice mail, then you must use a transcoding resource collocated with Cisco Unity Express to change the voice stream from G.729A to G.711 before the voice stream enters the AA or voice mail pilot numbers.
we are using g729 to traverse our wan. question i have is if the user doesnt pick up, where does the voice stream get its marching orders to use either 729 or 711 to talk to unity express or AA. does the router 2821 on the far end make that decision or does Call manager on the calling end decide which codec to use?
You will have to use transcoding resources collocated with Cisco Unity Express to change the voice stream from G.729A to G.711 before the voice stream enters the AA or voice mail pilot numbers. **(2821 at far end)**
Cisco CallManager Express 3.3: Transcoding Between G.729 and G.711
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