Mike's PBX Cookbook

Quick SRG50 Configuration

The Survivable Remote Gateway 50 (SRG50) is a new member of the Nortel family of survivable IP telephony branch office solutions that offer business continuity and public switched telephone network (PSTN) failover for voice over IP (VoIP) networks.

The Survivable Remote Gateway 50 (SRG50) operates as follows:

The SRG50 supports up to 32 survivable IP users.

To make a BCM50 into an SRG50, just enter the required keycodes!

SRG mode needs a keycode, and you may need others for IP trunking, expansion modules, etc..

Sometimes manually entering a KeyCode can be problematic, but using the keycode file (Load File), stored on a USB drive, seems to work everytime!

Edit the SRG50 IP address as required – the default gateway is the Private IP address – eg, Nortel Contivity 600, LAN 0 address.

Also,configure the type of dialing plan (CDP or UDP).
Configuration > Telephony > Dialing Plan > Private Network > Dialing Plan - Private Network panel > Private Network Settings subpanel

Enable MCDN TAT.
Configuration > Telephony > Dialing Plan > Private Network > Dialing Plan - Private Network panel > Private Network Settings subpanel

Edit Resources>Survivable Remote Gateway (this menu item is only there if the keycode is entered).

Enter the Main Office CS1000 IP addresses.
We use ESN CDP numbering.

Edit Resources>Telephony Resourses

Advertisment logo is whats displayed on the phone in "Local Mode", make sure the payload settings are correct.

Add the I2004 phones, they register WITH THE SRG (port 7300) – if the Main Office settings are correct, they will automatically be redirected by the SRG to the Main Office.

Status: Normal Mode means everything is correct, the set is redirected (under SRG control) to the Main Office


Destination codes and routes must be defined to route calls in and out of the SRG50. This process is not automatic, it must be defined! These paths are VIRTUAL – so don’t worry about tromboning, but .

Local (SRG) DID Trunks must be routed to the Main Office with destination codes and routes. The NRS will send the call back to the SRG to be answered.

Here, Target Line 126 receives digits 6382. It is forwarded to 8082, which is a destination code.

Destination Code 8082 will use Route 22, and delete all digits (the 8082)

(digits are deleted in the detination code, but may be added in the route)

NOTE: To allow tandem dialing from the main office through the SRG , or to redirect SRG IP telephones to use the SRG local PSTN, you must specify a remote package that provides access to the PSTN line pool. This remote package is then assigned to each VoIP trunk.

Configuration > Telephony > Call Security > Remote Access Packages

Route 22 will use the VoIP trunk route (BlocA) and insert digits 4362

NRS (at the Main Office) will route this call to extension 4262, which just happens to live on our local SRG.

The result is - an incoming Target Line receiving 6382 will ring on extension 4362.

‘9’  is also defined as a destination code, but in Normal Mode dial-9 calls are handled by the Main Office. However, in Local Mode (ie, the WAN is down and the Main Office is unreachable) this destination code allows calls out of the SRG using, in this case, POOL A – which is our local PTT trunk pool.

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