Nortel Networks 1140E User Manual

The Media Gateway 1000B (MG 1000B) provides a means of extending 
CS 1000 Release 4.5 features to one or more remotely located branch 
offices using the Branch Office feature. A branch office is a remote 
location in the network where IP Phones, PSTN access, and TDM IP 
Phones are located. Contact your system administrator to see if these 
functions are available for your use.

The Media Gateway 1000B (MG 1000B) IP Phone can operate in Normal 
or Local Mode.

The IP Phone registers with the Main Office and receives IP Phone 
services from the Main Office. At any time while using Normal Mode, you 
can check Local Mode functionality (make and receive calls) by enabling 
Local Mode and returning to Normal Mode. After testing, you can return to 
Normal Mode (see “Using Resume Normal Mode” on page 151) or wait 
for 10 minutes.

If the WAN connection goes down, the IP Phone loses communication 
with the Main Office TPS. It then registers with the MG 1000B and 
receives IP Phone services from the MG 1000B. Features such as 
Personal Directory, Redial List, and Callers List are not available when 
operating in Local Mode. When in Local Mode, the IP Phone displays the 
message LOCAL MODE.

Server 
Unreachable (1)

Network problem.

Notify system 
administrator if the 
problem persists.

Server 
Unreachable (2)

Network problem.

Notify system 
administrator if the 
problem persists.