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Bound Interface Name: Bound Interface decides where to send/receive the VOIP traffic.
Easy way to select the interface is to check the location of the SIP server. If it locates some
where in the Internet then select An y_WAN. If it is on the local network then select LAN.
Locale Selection: Select a country where you are located. The Router is embedded with
some default parameters according to different countries such as ring tones.
DSCP for SIP/RTP: DSCP(Differentiated Services Code Point) is the first 6 bits in the ToS
byte. DSCP marking allows users to assign specific application traffic to be executed in
priority by the next Router based on the DSCP value. Select DSCP for the SIP(Session
Initiation Protocol
) and RTP(Real-time Transport Protocol) respectively. If you are unsure,
please always keep the default value.
DTM F Relay setting: DTMF is Dual Tone Multi Frequency. Options available are SIPInfo,
RFC2833, and InBand. If you are unsure which one to choose, please always keep the
default value.
• SIPInfo – If it is selected, the Router will capture the DTMF tone and transfer it into SIP
form. Then it will be sent to the remote end with SIP message.
• RFC2833 – If it is selected, the Router will capture the keypad number you pressed and
transfer it into digital form then send to the other side; the receiver will generate the tone
according to the digital form it receives. This function is very useful when the network
traffic congestion occurs and it still can remain the accuracy of DTMF tone.
• InBand – If it is selected, the Router will send the DTMF tone as audio directly when you
press the keypad on the phone.
Registration Expire Timeout(s): Expire time for the registration message sending.
Registration Retry Interval(s): Set the time duration for your SIP Registrar server to keep
your registration record. Before the time expires, the Modem Router will send another register
request to SIP Registrar again. If you are unsure of it, please always keep the default value.
“No answer” time: Set the time duration after which the call is viewed as not answered.
Enable T38 support: T38 specifies a protocol for transmitting a fax across IP network in real
time. It allows the transfer of fax documents in real-time between two standard Group 3
facsimile terminals over the Internet or other networks using IP protocols. It will only function
when both sites support this feature and are enabled.
Click the Sav e button to make the configuration take effect.
4.10.8 Speed Dial
Choose “Voice ”“Speed Dial”, you will see the screen as shown in Figure 4-69. This section
introduces how to configure Speed Dial for your account.
Speed Dial function can help to store frequently used telephone numbers and make your dial more
convenient. It allows you to make a call by pressing a short number and the pound sigh # on the
phone keypad instead of the original number.
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