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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Introduction
Page 1-18Tandem Trunking and Tandem Switching
1
Figure 1–7 shows three MERLIN LEGEND systems in an SDN network. On
System A, the SDN trunks are assigned to pool 71. A user on System A calling the
user on System B dials 4013, the last four digits of the SDN number 957-4013.
System A routes the call using trunk pool 71 and prepends the digits 957.
Similarly, a user on System A calling the user on System C dials 2162. System A
routes the call using trunk pool 71 and prepends the digits 731.
The SDN can also be used for all of the toll calls as well as the calls within the
SDN. Any 10-digit number from MERLIN LEGEND users that does not fall within
the SDN numbering plan for the customer is routed over the PSTN (see Figure
1–7). This is a standard feature of SDN.
Considerations 1
■ Whether you are transferring calls to a non-local extension over the Public
Switched Network or an SDN, you must program the MERLIN LEGEND to
support trunk-to-trunk transfer.
NOTE:
Trunk-to-trunk transfer is not allowed when the line/trunk with the incoming
call is a loop-start line that is not programmed for reliable disconnect.
SECURITYlALERT:
!
Any changes to the trunk-to-trunk transfer setting (especially for voice
messaging ports or remote access ports) must be considered carefully in
order to minimize the potential for toll fraud. See Appendix A “Customer
Support Information” for security information.
■ For Release 6.1 and later systems, Centralized Voice Messaging is not
supported in an SDN environment.