Quality Of Service (Qos) - ZyXEL Communications Prestige 2302R User Manual

Table 21 VoIP Advanced (continued)
LABEL
Server Port
Use NAT
IP Address
Port
Outbound Proxy
Server Address
Server Port
NAT Keep Alive
Keep Alive Interval Set how often (in seconds) the Prestige should send SIP notify messages to the
DTMF Mode
Back
Apply
Reset

7.4 Quality of Service (QoS)

Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay,
and the networking methods used to provide bandwidth for real-time multimedia applications.
Chapter 7 VoIP Screens
DESCRIPTION
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.
Enable this feature to use a NAT router's public IP address and SIP port number in
the Prestige's SIP messages. You can use up to 127 ASCII characters.
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.
Enter the NAT router's public IP address or domain name (up to 127 ASCII
characters) in this field.
Enter the port number that your SIP sessions use with the public IP address of the
NAT router.
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).
Enter the IP address or domain name (up to 95 ASCII characters) of the SIP
outbound proxy server in this field.
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.
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.
SIP server.
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.
Click Back to return to the VoIP screen without saving configuration changes.
Click Apply to save your changes back to the Prestige.
Click Reset to begin configuring this screen afresh.
Prestige 2302R Series User's Guide
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