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3. 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)

H.323 Call Connecting Answer Mode

Case B: Hot Line Number” was assigned and the Hot line number belongs to remote H.323

device.

(Note: The remote H.323 device need Disable the “Auto Answer”)

1. When the call com from PSTN to FXO, FXO start the Hot line dialing to remote H.323

gateway

2. The phone of remote H.323 gateway start ring.

3. When the phone was picked up, the remote H.323 Gateway send “Q.931 connects”

signal to FXO port.

4. Once FXO port receives the “Q.931 connects” 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.

When the call com from PSTN to FXO, FXO start the Hot line dialing to FXS port.

The phone start ring.

Once the phone was picked up, FXO port would off-hook to answer the PSTN call.