by any chance are those SIP phones??
On Type-A IP phones running SIP, if Call Forward All is invoked from the phone itself, the device's Rerouting Calling Search Space is used for forwarded calls. If Forward All actions are invoked from the Unified CM User page or the Unified CM Administrative page, then any Forward All action initiated from the phone is irrelevant.
Dial Plan
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/6x/dialplan.html
HTH
javalenc
if this helps, please rate
HTH
java
if this helps, please rate