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| Table 14 VoIP Advanced (continued) | |
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| LABEL | DESCRIPTION |
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|
| Server Port | Enter the STUN server’s listening port for STUN requests in this field. Leave this |
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| field set to the default if your VoIP service provider did not give you a server port |
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| number for STUN. |
| Use NAT | Enable this feature to use a NAT router’s public IP address and SIP port number in |
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| the Prestige’s SIP messages. |
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| You must also configure the NAT router to forward traffic with this port number to |
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| the Prestige. |
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| This eliminates the need for STUN or a SIP ALG. |
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|
|
| IP Address | Enter the NAT router’s public IP address or domain name (up to 127 ASCII |
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| characters) in this field. |
| Server Port | Enter the port number that your SIP sessions use with the public IP address of the |
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| NAT router. |
| Outbound Proxy | Enable this feature if your VoIP service provider has a SIP outbound server to |
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| handle voice calls. This allows the Prestige to work with any type of NAT router and |
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| eliminates the need for STUN or a SIP ALG. Turn off a SIP ALG on a NAT router in |
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| front of the Prestige to keep it from retranslating the IP address (since this is |
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| already handled by the outbound proxy server). |
| Server Address | Enter the IP address or domain name (up to 127 ASCII characters) of the SIP |
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| outbound proxy server in this field. |
| Server Port | Enter the SIP outbound proxy server’s listening port for SIP outbound proxy |
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| requests in this field. Leave this field set to the default if your VoIP service provider |
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| did not give you a server port number for the SIP outbound proxy server. |
| Enable NAT Keep | You must have outbound proxy enabled to use NAT keep alive. |
| Alive | Enable NAT keep alive to have the Prestige send SIP notify messages to the SIP |
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| server. Use this to keep a NAT router located between the Prestige and the SIP |
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| 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 |
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| SIP server. |
| DTMF Mode | The |
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| tones that your telephone makes when you push its buttons. It is recommended |
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| that you use the same mode that your VoIP service provider uses. |
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| Select RFC 2833 to send the DTMF tones in RTP packets. |
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| Select PCM (Pulse Code Modulation) to include the DTMF tones in the voice data |
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| stream. This method works best when you are using a codec that does not use |
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| compression (like G.711). Codecs that use compression (like G.729) could distort |
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| the tones. |
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| Select SIP INFO to send the DTMF tones in SIP messages. |
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| MWI (Message | Enable Message Waiting Indication (MWI) to have your phone give you a |
| Waiting Indication) | |
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| 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 |
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| message waiting service after receiving a SIP SUBSCRIBE message from the |
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| Prestige. |
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| The SIP server stops providing the message waiting service if it has not received |
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| another SIP SUBSCRIBE message from the Prestige before this time period |
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| expires. |
Chapter 6 VoIP Screens | 63 |