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1. Voice-over-Broadband Networking 1000-A2-GN22-00
1-6 February 2003
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.
Figure 1–5. Subscriber Initiates a Call
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0352
PSTN
Telephone IAD CPX-1000 Class 5 Switch