Planet VIP-281 Series User Manual page 48

Scenario description: SIP call connecting answer mode
Case B: "Hot Line Number" was assigned and the hot line number belongs to SIP device.
1. When the call com from PSTN to FXO, FXO start the Hot line dialing to remote SIP
gateway
2. The phone of remote SIP gateway start ring.
3. When the phone was picked up, the remote SIP Gateway sends "SIP 200 OK" signal to
FXO port.
4. Once FXO port receives the "SIP 200 OK" signal, FXO port would off-hook to answer the
PSTN call.
Case C: "Hot Line Number" was setting and the Hot line number was assigned to another
FXS port in same Gateway.
1. When the call com from PSTN to FXO, FXO
start the Hot line dialing to FXS port.
2. The phone start ring.
3. Once the phone was picked up, FXO port
would off-hook to answer the PSTN call.
the Phone (connected to the FXS port) was picked up
by user.
(Note: This case can avoid the Local PSTN charge
when the FXS port still ring.)
6. Non Answer Mode: FXO will NOT answer the call in
any time.
(Note: Some ITSP only let the FXO for termination
function, they do not user use the FXO port for
origination)
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