Paradyne CPX-1000 manual Call Origination and Completion, Subscriber Initiates a Call

1. Voice-over-Broadband Networking 1000-A2-GN22-00

Call Origination and Completion

These steps describe the network interaction that occurs when a subscriber initiates a call (Figure 1–5):

1.A subscriber initiates the call by taking the telephone off-hook.

2.The IAD notifies the CPX through the Common Channel Signaling (CCS) channel in the voice PVC.

3.The CPX sends an outgoing call request message to the Class 5 switch through the PSTN (GR-303 protocol) Time Management Channel (TMC).

4.The Class 5 switch selects the available time slot in a PSTN interface group and directs the CPX to connect the IAD port to the specified time-slot on the switch.

5.The host Class 5 switch provides dial tone.

6.The CPX cuts the calling station through to the switch.

7.The subscriber dials the destination number and the Class 5 switch collects DTMF digits.

8.The Class 5 switch routes the call, returns the call progress, and generates a call data record.

9.The CPX notifies the Class 5 switch when the station hangs up.

Telephone	IAD	CPX-1000	Class 5 Switch
1
	2
		3
			4
			5
		5
	5
		6
7
	7
		7
			8
			PSTN
9
			0352

Figure 1–5. Subscriber Initiates a Call

1-6 February 2003