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Chapter 21 Voice 173

Don't send re-

Invite to the

remote party

when there are

multiple codecs

answered in the

SDP

Do not send a re-Invite packet to the remote party when the remote party answers

that it can support multiple codecs??

Bound Interface

Name

Bound Interface

Name

If you select LAN or Any_WAN, the Router automatically activates the VoIP service

when any LAN or WAN connection is up.

If you select Multi_WAN, you also need to select the pre-configured WAN

connections. The VoIP service is activated only when one of the selected WAN

connections is up.

Outbound Proxy

Address

Enter the IP address or domain name of the SIP outbound proxy server if your VoIP

service provider has a SIP outbound server to handle voice calls. This allows the

Router to work with any type of NAT router and eliminates the need for STUN or a

SIP ALG. Turn off any SIP ALG on a NAT router in front of the Router to keep it from

re-translating the IP address (since this is already handled by the outbound proxy

server).

Outbound Proxy

Port

Enter the SIP outbound proxy server’s listening port, if your VoIP service provider

gave you one. Otherwise, keep the default value.

RTP Port Range

Start Port

End Port

Enter the listening port number(s) for RTP traffic, if your VoIP service provider gave

you this information. Otherwise, keep the default values.

To enter one port number, enter the port number in the Start Port and End Port

fields.

To enter a range of ports,

• enter the port number at the beginning of the range in the Start Port field.

• enter the port number at the end of the range in the End Port field.

DTMF Mode

DTMF Mode Control how the Router handles the tones that your telephone makes when you

push its buttons. You should use the same mode your VoIP service provider uses.

RFC2833 - send the DTMF tones in RTP packets.

InBand - send the DTMF tones in the voice data stream. This method works best

when you are using a codec that does not use compression (like G.711). Codecs that

use compression (like G.729 and G.726) can distort the tones.

SIPInfo - send the DTMF tones in SIP messages.

Table 98 SIP Server (continued)

LABEL DESCRIPTION