Planet VIP-281 Series User Manual page 78

Note: Some ITSP only let the FXO for termination function, they do not user use the FXO port for
origination
SIP Call Connecting Answer Mode
Scenario B description:
Hot Line Number" was assigned and the hot line number belongs to SIP device.
a) When the call com from PSTN to FXO, FXO start the Hot line dialing to remote SIP gateway
b) The phone of remote SIP gateway start ring.
c) When the phone was picked up, the remote SIP Gateway sends "SIP 200 OK" signal to FXO port.
d) Once FXO port receives the "SIP 200 OK" signal, FXO port would off-hook to answer the PSTN call.
Scenario C description:
"Hot Line Number" was setting and the hot line number was assigned to another FXS port in same
gateway.
a) When the call com from PSTN to FXO, FXO start the Hot
line dialing to FXS port.
b) The phone start ring.
c) Once the phone was picked up, FXO port would off-hook
to answer the PSTN call.
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