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P-2002 Series User’s Guide
Chapter 6 VoIP Screens 63
Server Port Enter the STUN server’s listening port for STUN requests in this field. Leave this
field set to the default if your VoIP service provider did not give you a server port
number for STUN.
Use NAT Enable this feature to use a NAT router’s public IP address and SIP port number in
the Prestige’s SIP messages.
You must also configure the NAT router to forward traffic with this port number to
the Prestige.
This eliminates the need for STUN or a SIP ALG.
IP Address Enter the NAT router’s public IP address or domain name (up to 127 ASCII
characters) in this field.
Server Port Enter the port number that your SIP sessions use with the public IP address of the
NAT router.
Outbound Proxy Enable this feature if your VoIP service provider has a SIP outbound server to
handle voice calls. This allows the Prestige to work with any type of NAT router
and eliminates the need for STUN or a SIP ALG. Turn off a SIP ALG on a NAT
router in front of the Prestige to keep it from retranslating the IP address (since this
is already handled by the outbound proxy server).
Server Address Enter the IP address or domain name (up to 127 ASCII characters) of the SIP
outbound proxy server in this field.
Server Port Enter the SIP outbound proxy server’s listening port for SIP outbound proxy
requests in this field. Leave this field set to the default if your VoIP service provider
did not give you a server port number for the SIP outbound proxy server.
Enable NAT Keep
Alive
You must have outbound proxy enabled to use NAT keep alive.
Enable NAT keep alive to have the Prestige send SIP notify messages to the SIP
server. Use this to keep a NAT router located between the Prestige and the SIP
server from timing out and dropping your Prestige’s SIP NAT sessions.
Keep Alive Interval Set how often (in seconds) the Prestige should send SIP notify messages to the
SIP server.
DTMF Mode The Dual-Tone MultiFrequency (DTMF) mode sets how the Prestige handles the
tones that your telephone makes when you push its buttons. It is recommended
that you use the same mode that your VoIP service provider uses.
Select RFC 2833 to send the DTMF tones in RTP packets.
Select PCM (Pulse Code Modulation) to include 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) could distort
the tones.
Select SIP INFO to send the DTMF tones in SIP messages.
MWI (Message
Waiting Indication)
Enable Message Waiting Indication (MWI) to have your phone give you a
message–waiting (beeping) dial tone when you have a voice message(s). Your
voice service provider must have a messaging system that supports this feature.
Expiration Time Use this field to set how long the SIP server should continue providing the
message waiting service after receiving a SIP SUBSCRIBE message from the
Prestige.
The SIP server stops providing the message waiting service if it has not received
another SIP SUBSCRIBE message from the Prestige before this time period
expires.
Table 13 VoIP Advanced (continued)
LABEL DESCRIPTION