Information Technology Reference
In-Depth Information
Foundation Topics
Describe Extension Mobility in CUCM
Key
To p i c
Cisco Extension Mobility (EM) allows a user to log in to any phone in the CUCM cluster
(and as of version 8.x, cross-cluster). In environments where workers move from desk to
desk, this allows their personal configurations, such as directory numbers (DN) and speed
dials to be dynamically set up on the IP Phones they are currently using, making them
reachable at the same extension number regardless of which phone they are using.
EM operates as an IP Phone service, applying user-specific Device Profiles to the phone
the user logs in to. Once the phone(s) are subscribed to the Extension Mobility Service,
the user selects that service on the phone and enters his User ID and PIN when prompted
(using the phone keypad in alphanumeric mode, similar to texting on a cell phone). CUCM
then applies the user Device Profile settings and resets the phone. Separate Device Pro-
files must be created for each phone model a user might log in to. For example, suppose
the user's primary phone is a 7965 with six buttons set up for two DNs and four speed di-
als. When the user logs in to a 7942 with only two buttons, the Device Profile defines
what to configure on the two buttons: one DN and a speed dial, two DNs, or whatever the
user needs. The user must select the correct profile from a list if multiple profiles exist.
If a user logs in to multiple phones concurrently, administrators have three options to de-
termine how the system behaves:
Allow multiple logins: The user can be logged in to multiple phones at the same
time. When this happens, the effect is that of a shared line: All the phones will ring
when the DN configured on each of them is called.
Deny login: The user can only be logged in to one device at a time. When he at-
tempts to log in to a second device, he receives an error message. He must log out of
the first device before the second login will succeed.
Auto-logout: The user can only be logged into one device at a time. When he at-
tempts to log in to the second device, the system automatically logs him out of the
first device, and the second login succeeds.
When the device is logged out, either another Device Profile can be applied (typically a
logout Device Profile, perhaps allowing on-net and emergency calls only), or the settings
in the phone configuration page are applied.
The Device Profile settings include the following:
User Music on Hold (MoH) audio source
Phone button template
Softkey template
User locale
Do not disturb (DND)
 
 
 
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