PLANET VIP-156PE - Manual (Page 60)

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Test the scenario:
1. VIP-156_C pick up the telephone
2. Dial the number 1001(VIP-156_A),
3. Because VIP-156_A had set up All Forward function to the number 2002(VIP-156_B)
4. The number 2002(VIP-156_B) will ring up then it pick up the telephone and communication
with the number 3003(VIP-156_C)