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Test the scenario:
1. The Phone Number 11112222 pick up the telephone
2. Dial the PSTN Phone Number 33334444(VIP-157_A)
3. VIP-157_A will ring up but doesn’t answer the call
4. After 3 rings, the Phone Number 11112222 will hear the prompt sounds then input the
password 123#
5. The Phone Number 11112222 will hear the dial tone then input 0#
6. The IP address 192.168.0.2 (VIP-156_B) will ring up then it pick up the telephone and
communication with the Phone Number 11112222
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