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SIP Operation Manual
Telephone Interface Description
Example for 4S gateway:
4S gateway 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 4S 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.
