AT&T DEFINITY Remote Port Security Device Informations techniques télécharger pdf (Page 289)

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Issue 7 June 2001 9-1

Call Routing

Call Routing Call Flow

The following is the basic call flow through the 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: User dials 0. Call is routed to an attendant because zero is defined as

an attendant call requiring one digit.

Example: User dials 2. Digit two is defined as a 4-digit extension code on the dial

plan form. Three more digits are required to place the call. The three additional

digits are dialed. The four digits dialed determine the destination called.

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