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Nortel M7324 & M7310
Nortel Norstar Mics Phone System W/9 Black M7310 Phones 1-m7324 By Nortel 7.1 Software
Nortel / Norstar Meridian, (Northern Telecom, Meridian Norstar, Nortel Norstar)
The Meridian Norstar, later called Nortel Norstar was a small-office digital PBX introduced by Northern Telecom (now Nortel). It is based on the same internal design and instruction set as Nortel's earlier SL-1 and DMS systems, allowing it to support features such as Meridian Mail, automatic call distribution and other features, but can support a total of up to 192 phones and has limited processing power. In the United Kingdom it is sold by British Telecom, rebadged as the BT Norstar.
With the advent of LSI ICs, also called integrated circuits in the 1980's, key telephone system design went from electro-mechanical parts to electronic or fully digital parts. The first key system developed by Northern Telecom in the early 1980's was the Vantage TDD system. Unlike the success of the SL-1 system, the Vantage system did not catch with the business environment and the Meridian Norstar was developed as its replacement.
In 1988, Nortel developed the Meridian Norstar system. This system directly competed with the AT&T Merlin, ROLM Redwood, Executone/Isotec Hybrid systems, Toshiba DK Strata, and NEC hybrid systems.  Unlike the earlier Vantage system, the Norstar went on to be one of the leading telephone systems in the world. It is visible worldwide with installations at major retail chains, educational environments, medical institutions, government facilities, and many places where key telephone systems are required.
The Norstar system went further than the other systems in similarity to a PBX system such as the Meridian SL-1/Meridian 1 system developed in the late 1980's as well. This allowed blurring the distinction of key telephone system versus PBX telephone system. Many features such as Direct Inward Dial, Caller ID, Automatic Call Distribution, and Call Accounting were designed off the larger Meridian 1 PBX, DMS-100 and Meridian SL-100 as opposed to being developed as an independent system.
Although there were many hardware/design similarities between the Norstar systems and larger Meridian 1/Meridian SL-100 systems, the telephones themselves could not be used interchangeably between the key system and PBX. They were, however, backwards compatible on their respective switch. That is, you can use the oldest Meridian M7000 telephones on the newest Business Communication Manager system. You can also use the latest T7000 series telephones on an older Norstar system such as the DR5.1. This allows companies to invest in hardware as needed.
Nortel Norstar Telephone Design
When introduced in 1988, Norstar telephones were developed with highly advanced features. The telephones came with LCD displays, heavy duty aerodynamic handsets/telephone body, color coded keys with easy to read fonts, grey, ash and black colors, a high quality speaker phone, quick reference card located underneath the handset, high clarity handset voice quality, and a very rugged solid telephone.