Nortel Remote Gateway 50 Configuration Manual page 211

• Set the destination code for the VoIP trunk to 6, the same value as the
access code. For example, BUID dialout = 632XX.
The main office access code length is still 0.
• Assign the telephones registered to the SRG (IP Phones or analog
[500/2500-type] telephones) to a different range, such as 30XX, than the
telephones registered to the main office.
SRG users must dial the destination code before the DN when making a
call to a telephone in the main office, whether they are in Normal or
Local Mode. When calling another IP Phone in the SRG, SRG users dial
only the DN, whether they are in Normal or Local Mode. The main office
uses VNR to route SRG DNs to the SRG in both Normal and Local
Mode.
For more information on configuring the main office and NRS, refer to
Branch Office: Installation and Configuration (553-3001-214) and IP Peer
Networking: Installation and Configuration (553-3001-213). For more
information on configuring the SRG, refer to SRG50 Configuration Guide.
Option 3: DNs of SRG IP Phones and DNs in the main office
overlap in Normal Mode, but are unique in Local Mode
In this CDP configuration, each node on the network has unique leading digits
that is included in the DN range. The unique leading digits indicate the private
network code for the system.
This configuration allows seamless dialing for users registered at the SRG,
but main office users must dial a different DN to call SRG IP Phones in
Normal and Local mode. Therefore, SRG IP Phones have DNs and BUIDS
that do not match.
In Figure 72 on
the SRG to accommodate the SRG Private Network Code. On the main
office, the SRG IP Phones are given a DN (BUID) starting with 3, the main
office Private Network Code. The NRS is programmed to recognize that 3X
numbers go to the main office and that 4X numbers go to the SRG.
In Normal mode, when a call is directed into the SRG, or from a telephone
registered at the SRG, to the SRG IP Phone in Normal mode, the SRG system
translates the SRG IP telephone DN (4XXX) to the main office BUID
Main Office Configuration for Survivable Remote Gateway 50
Dialing Plan configuration
page 212, the SRG IP Phones have a DN starting with 4 on
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Configuration Guide