User`s manual

sending the DTMF tone in the voice packet. The other is “out band”, that is, sending the DTMF

tone as a signal. Sending DTMF tone as a signal could tolerate more packet loss caused by

the network. If this selection is enabled, the DTMF tone will be sent as a signal.

Voice Codec option:

The Codec is used to compress the voice signal into data packets. Each Codec has different

bandwidth requirement. There are four kinds of Codec, G.723, G.729AB, G.711_u and

G.711_A. The default value is G.723.

H.323 Start Mode:

This selection could force the Gateway to use normal start mode (default mode) or fast start

mode when establishing a VoIP call. Many other gateways only support normal start mode,

enable this selection when it is necessary. The default is disabled (using fast start mode).

H.323 H.245 Tunneling

This selection could force the Gateway to use normal start mode (default mode) or fast start

mode when establishing a VoIP call. Many other gateways only support normal start mode,

enable this selection when it is necessary. The default is disabled (using fast start mode).

FAX Mode Option

T.30/T.38 real-time FAX compliant Voice/FAX auto-switch.

The T.38 is a “Real Time Group 3 Fax Communication over IP network” format. That’s

meaning it’s a protocol for Fax over IP. You have to enable this function

H.323 Registration type:

There are 2 choices for this setting. “Gateway” means it will act as the VoIP gateway.

“Terminal” means it will act as the IP phone terminal.

FXS Impedance:

The FXS provides 600/900 OHM impedances for selection.

FXO AC Impedance:

The FXO provides wild and complex ac termination impedances for selection.

H.323 call auto answer mode:

When a VoIP call is incoming, the Gateway will ring a specific phone set. The H.323 call signaling

part could be connected or alerting during this ringing period. If this selection is enabled, the

H.323 signaling part is connected during the ringing period. The benefit of this situation is that

the remote side could hear the status of the specific port. That is, the remote side will hear ring

back tone if the Gateway is really ringing the phone set. If the phone set is busy, the remote side

will hear busy tone. The disadvantage of this situation is that the H.323 connected time is not the

real voice call connected time. So, if billing is recorded for this Gateway, this function should be

disabled.

Phone (Line) in/out volume:

You can adjust the Phone (Line) in/out volume, range from -9db to 9db.

FXO Tx/Rx Gain:

You can adjust the FXO Tx/Rx Gain , range from 0db to 6db.

UK release tone detection:

When you use the Gateway to UK , you can Enable this selection to detection release tone.

Flash detection and generation duration :