Telephone Interface Description; Example For Dvg-5004S - D-Link DVG-7022S User Manual

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Telephone Interface Description

Example for Phone Ports:
Phone Ports connecting directly to phone sets
After connecting telephone sets to P1-P4, users can make direct calls, (P1-P4 are FXS
interfaces). Each set acts as an independent extension line.
Integrating the Phone Ports with PBX
P1-P4 is FXS interfaces, and some of them can be connected to telephone sets for direct calls.
Others can be connected to the PBX so other extension lines can make VoIP calls.