Hi nam,
A couple of things to check. Have you set the Forward Busy/No Answer "External"
on the DN config page in CUCM?
Are the calls coming in using a codec other than g.711?
Best Practices for Deploying Cisco Unity Express
• Each mailbox can be associated with a primary extension number and a primary E.164 number.
Typically, this number is the direct-inward-dial (DID) number that PSTN callers use. If the primary
E.164 number is configured to any other number, use Cisco IOS translation patterns to match either
the primary extension number or primary E.164 number so that the correct mailbox can be reached
during SRST mode.
• Each Cisco Unity Express site must be associated with a CTI route point for voicemail and one for
AA (if licensed and purchased), and you must configure the same number of CTI route points as
Cisco Unity Express ports licensed. Ensure that the number of sites with Cisco Unity Express does
not exceed the CTI scalability guidelines presented in the chapter on Call Processing, page 8-1.
• Cisco Unity Express is associated with a JTAPI user on Cisco Unified CallManager. Although a
single JTAPI user can be associated with multiple Cisco Unity Expresses in a system, Cisco
recommends associating each dedicated JTAPI user in Cisco Unified CallManager with a single
Cisco Unity Express.
• Calls into Cisco Unity Express use G.711 only. Cisco recommends using a local transcoder to
convert the G.729 calls traversing the WAN into G.711 calls. You can configure Cisco Unified
CallManager regions with the G.711 voice codec for intra-region calls and the G.729 voice codec
for inter-region calls.
• If transcoding facilities are not available at the Cisco Unity Express site, provision enough
bandwidth for the required number of G.711 voicemail calls over the WAN. Configure the Cisco
Unified CallManager regions with the G.711 voice codec for calls between the IP phones and Cisco
Unity Express devices (CTI ports and CTI route points).
• The CTI ports and CTI route points can be defined in specific locations. Cisco recommends using
location-based call admission control between Cisco Unified CallManager and Cisco Unity Express.
RSVP may also be used.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/4x/42unityx.pdf
Cheers!
Rob
"Far away from your trouble and worry
You belong somewhere you feel free" - Tom Petty
