User Manual

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)

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.