Nortel BCM 3.7, Manual

Page: 532 / 1004

532 Understanding MCDN network features
N0008589 3.3
Understanding MCDN network features
When you connect your Business Communications Manager systems through an SL-1 and use the
MCDN protocol, your network provides a number of network call features. You can use this
protocol to network other Business Communications Manager systems, such as the tandem
system, shown in the previous section, Norstar systems, or Meridian 1 systems.
Note: For information about networking voice over IP (VoIP) trunks using MCDN, refer to the IP
Telephony Configuration Guide .
The following table lists the MCDN features that are provided by all networks connected with
SL-1 lines, with MCDN active. The features affect call redirection and trunking functions.
Network Call Redirection Information
NCRI builds on the following Business Communications Manager features:
• External Call Forward
• Call Transfer
• Call Forward
NCRI adds the ability to redirect a call across an MCDN network using Call Forward (all calls, no
answer, busy) and Call Transfer features. The call destination also receives the necessary
redirection information. This feature allows the system to automatically redirect calls from within
a Business Communications Manager system to the mail system, such as Meridian Mail, which
resides outside the Business Communications Manager system on the Meridian 1.
The following figure shows an example of this situation, where user A calls user B on the same
Business Communications Manager. If user B is busy or not answering, the call automatically gets
transferred to a Meridian Mail number (user C) across an MCDN link between the Business
Communications Manager system and the Meridian 1 system where the mailboxes are set up.
Refer to
“Assigning Call Forward” on page 421
Table 121 MCDN network features
Centralized messaging • “Network Call Redirection Information” on page 532 (NCRI)
Centralize trunking • “ISDN Call Connection Limitation” on page 534 (ICCL)
• “Trunk Route Optimization” on page 535 (TRO)
• “Trunk Anti-tromboning” on page 536 (TAT)