Instruction manual

Issue 9 May 2003 10-1
10
Call routing
NOTE:
Unless specifically stated otherwise, references in this document to “G3Vx
and later” include the specified DEFINITY G3 (and more recent) versions,
DEFINITY ECS, MultiVantage™ Software, and Communication Manager.
Call routing call flow
The following is the basic call flow through Communication Manager,
MultiVantage™ Software, DEFINITY ECS, DEFINITY G1 and G3, or System 75:
■ Endpoint signals switch to start call.
■ If originating endpoint is a station, the request for service is an
off-hook.
■ If originating endpoint is a trunk, the request for service is seizure
signal (wink start, off-hook, ground start).
■ The switch signals endpoint to start dialing.
■ If the endpoint is a station, dial tone is played for the caller.
■ If the endpoint is a trunk, a start dial signal (wink dial tone, etc.) is
sent to the originating end.
■ The digit string is dialed.
■ The first digit dialed is compared to dial plan record.
■ The type of call is identified depending on the dialed digit.
■ The calls can be to an extension number, trunk access code, attendant, or
feature access code.
■ The number of digits needed is known after the first digit is dialed.
Example 1: User dials 0. Call is routed to an attendant because zero is defined as
an attendant call requiring one digit.