Hi Jack,
Have a look at the following Nortel PBX requirements for the PIMG integration;
Cisco Unity
Nortel Meridian 1 PIMG Integration Guide for Cisco Unity 4.0
Requirements
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The Nortel Meridian 1 integration supports configurations of the following components:
Phone System
•One of the following models:
–Nortel Meridian 1 phone system (Option 11, 21, 51, 61, 71, or 81), software release 17 or later.
–Nortel Succession phone system, software release 3.0 or later.
–The Nortel SL 1 phone system, when upgraded to Meridian 1 so that it is compatible with the M2616 digital phone.
•The following software option packages installed:
–Package 19, Digit Display Software (DDSP)
–Package 46, Message Waiting Center (MWC)
•One or more digital lines that are compatible with the M2616 digital phone for connecting to the PIMG units.
•One or more of the applicable PIMG units. For details, refer to the "Supported Circuit-Switched Phone System Integrations" section in your version of Cisco Unity System Requirements at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_installation_guides_list.html.
•The voice messaging ports in the phone system connected by digital lines to the ports on the PIMG units.
We recommend that you connect the voice messaging ports on the phone system to the ports on the PIMG units in a planned manner to simplify troubleshooting. For example, the first phone system voice messaging port connects to the first port on the first PIMG unit, the second phone system voice messaging port connects to the second port on the first PIMG unit, and so on.
•The PIMG units connected to the same LAN or WAN that Cisco Unity is connected to.
•If the PIMG units connect to a WAN, the requirements for the WAN network connections are:
–For G.729a codec formatting, a minimum of 32.76 Kbps guaranteed bandwidth for each voice messaging port.
–For G.711 codec formatting, a minimum of 91.56 Kbps guaranteed bandwidth for each voice messaging port.
–No network devices that implement network address translation (NAT).
–A maximum 200 ms network latency.
•The phone system ready for the integration, as described in the documentation for the phone system.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_configuration_guide09186a0080430d68.html#wp1022253
Hope this helps!
Rob
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