This is a Network Time Protocol (NTP) clocking issue.
To resolve the issue, perform these steps:
Configure the Cisco CallManager Express as the master NTP service:
This is the CallManager Express configuration:
ntp clock-period 17208405 ntp master 1 ntp server 10.66.81.91 (this is my fastethernet interface)
This is the Cisco Unity Express configuration:
clock timezone Australia/Sydney ntp server 10.66.81.91 ( this is the CME router).
Allow the IP phones to dial a six or a nine, and point them to other department numbers, as shown:
translation-rule 20 Rule 0 6 1000 Rule 1 9 1003
ephone-dn 2 dual-line number 1001 description 1001 name 1001 translate called 20
If you dial a six on the IP phone number 1001, it goes to 1000. If you dial a nine, it goes to 1003.
When the assistant wants to dial directly to voice mail by adding an eight in front of the extention, this voice translation rule and profile strips off the eight in the re-directing number and sends the call straight to the extention voice mail box.