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TD-VG3511 150Mbps Wireless N VoIP ADSL2+ Modem Router User Guide

Figure 4-42

SIP Advanced Setup:

¾ 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 Any_WAN. If it is on the local network then select LAN.

¾ 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.

¾ 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.

¾ Dtmf 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.

¾ Registration Expire Timeout(s): Expire time for the registration message sending.

¾ 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.

¾ 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

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