To support migration of CS 1000 users to Avaya Aura®, the Multiple Appearance Directory Number (MADN) feature is now implemented in Communication Manager Release 8.0. The MADN feature was originally implemented on Nortel CS 1000. This feature is almost similar to the existing Communication Manager bridging feature.

As implemented on Nortel CS 1000, MADN has two flavors:

• Single call arrangement

• Multiple call arrangement

• The Single call arrangement feature operation is similar to the existing Communication Manager bridging feature with exclusion enabled. To enable single call arrangement like operation on Communication Manager, configure traditional per-call appearance bridges and enable exclusion by using Class of Service for the principal. For more information on bridging, see Avaya Aura® Communication Manager Feature Description and Implementation.

• The Multiple call arrangement feature defines a new form of bridge alerting that associates a bridge button to a principal extension, and not to a specific call appearance of a principal extension. A multiple call arrangement bridge allows an alerting bridge user to answer a call alerting on any call appearance of the principal, or even a call that does not alert at the principal because all principal call appearances are in use.

• Traditional per-call appearance bridge button: brdg-appr B:1 E:1000

• MAC per principal bridge button: brdg-appr B:a E:1000

By specifying the bridge button identifier (B) with the value a, this allows any call to principal 1000 to alert at this bridge button. A MAC bridge button may be used on any multi-call appearance DCP, H.323, or SIP station.

Traditional per-call appearance bridge buttons for station 1000 may exist on stations like 1001, 10002, 1003. While MAC bridge buttons for station 1000 may exist on stations like 2001, 2002, 2003. It is not valid for a station to have both per-call appearance and multiple call arrangement bridges for the same principal. Which means, station 1001 cannot have brdg-appr B:1 E:1000 and brdg-appr B:a E:1000.

Multiple call arrangement operation differs significantly on call answer. For an incoming call to a principal station, Communication Manager alerts all stations that have per-call appearance bridge matching a principal and for the particular call appearance. Additionally, Communication Manager alerts all stations that have an idle multiple call arrangement bridge for that principal.

If the call is answered on single call arrangement bridge, the principal and other per-call appearance bridges get a simulated bridge appearance. But, all multiple call arrangement bridge appearances are dropped.

However, if the call is answered at the multiple call arrangement bridge appearance, then:

• The principal gets dropped

• All the alerting single call arrangement bridge stations are dropped

• All the alerting multiple call arrangement bridge stations that did not answer the call gets dropped