We do not have AA in place. Could you please what COS option I need to change for "enable external caller id in the embedded vm ports COS"?
I have found following thread
http://www.tek-tips.com/viewthread.cfm?qid=1697119 but as suggested enabling the following COS options assigned to the VM ports does not do any good.
Display ANI/ISDN Calling Number Only
Display ANI/DNIS/ISDN Calling/Called Number
Display Caller ID on Multicall/Keylines
The only diffrence I could see was that the subject "Voice Mail Message <775587412 >" changed to "Voice Mail Message <418@pbx.mercury.intra>" when calling from 775587412 to extension 418 (Display ANI/DNIS/ISDN Calling/Called Number was set from No to Yes).