it is possible to do in CUCM 6.1 so it,s no reason why can no be possible i n CUCM 7. I solve this isue with creating new entry for end user and for cell phone number without Device Associations.
User ID XXXXXXXXXX
last name Y
First name X
Telephone number - 7568
Controled Device (select IP phone)
Primary Extension 7568
For cell phone
User ID XXXXXXXXXX - cell phone
Last name Y
First name X - Cell phone
Telephone number - cell phone
Controled Device - none
Primary Extension - none
In this way when you search corporate directory for user X you will have two resaults
1. First name, last name, primary extesnsion
2. First name - cell phone, last name , cell phone number
