Nortel Networks Remote Gateway 50 - Manual (Page 25)

Overview Page 25 of 258
Main Office Configuration for Survivable Remote Gateway 50 Configuration Guide
Nortel recommends testing Local Mode operation after changing the
provisioning for a telephone on the SRG.
To ensure that users do not forget to resume Normal Mode operation, the
SRG redirects the telephone to the main office to return the telephone to
Normal mode. This occurs if the telephone remains registered to the SRG in
Test Local Mode for ten minutes (default setting). Alternatively, the user can
press the Quit key
X
from the set to return to Normal Mode.
For further information about Local Mode functionality for SRG, refer to
SRG50 Configuration Guide.
Virtual Trunks
In order for endpoints in the CS1000 network to access endpoints in local
mode at the SRG or to access the PSTN at the SRG, Virtual Trunks are used
over the LAN/WAN.
Virtual Trunks are software components that provide the trunking features of
the Meridian Customer-Defined Network (MCDN) feature set. Access to
PSTN digital or analog trunks at the branch office occurs through the MCDN
Virtual Trunk.
For more information about Virtual Trunks, refer to IP Peer Networking:
Installation and Configuration (553-3001-213).
Note: Virtual Trunks are sometimes referred to as H.323 IP Peer Trunks.
In the SRG50 Configuration Guide, Virtual Trunks are referred to as IP
Trunks.
IP Phone calls
When an IP Phone calls another IP Phone, each telephone receives the
address of the other to exchange media directly between the telephones.
When in Normal Mode, an SRG IP Phone calling a main office IP Phone does
not require any trunking to set up the call. However, LAN/WAN bandwidth
is used to provide a media path for the call. For more information on Direct
IP media path functionality, see IP Peer Networking: Installation and
Configuration (553-3001-213).