Nortel Modular ICS 7.1, Инструкция по установке

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/ Working with ISDN
Modular ICS 7.1 Installer Guide N0130943 02
line 001, either line 001 or line 002 is selected. For loops
which use a single SPID, assign both lines on a loop to a
telephone to guarantee that all calls appear at the
telephone.
Programming Direct Inward System Access (DISA) on
PRI trunks
When a trunk cartridge is set to PRI, all lines on that trunk are
set to Auto Answer without Direct Inward System Access
(DISA).
DISA can be accessed by one of two methods.
1) Define the DISA DN to match the trailing digits of the
Called Party Number (CDN).
With Public, Private, and Tie service types, the CDN is
simply truncated to the Target Line Receive Digit Length
and is parsed to match the Target Line Receive Digits.
DISA can be accessed by having the DISA DN match the
trailing digits of the CDN. For example, with a Receive
Digit Length = 4, and DISA DN = 1234, a call made to
Public DN 763-1234 will be handled as follows:
• the ISDN setup message will contain a CDN of 763-1234
• the CDN will be truncated to the four digits, 1234
• 1234 matches the DISA DN
• the call will be answered with DISA
2) Use incoming Call by Call (CbC) Service routing to map the
call type to the DISA DN. Refer to Programming Call by
Call service selection on page 475 for more information.
With FX, INWATS, 900, and SDS service types, either a
Service Id (SID) or a CDN is mapped to Target Line
Receive Digits.