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| Table 23 VoIP Advanced (continued) | |
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| LABEL | DESCRIPTION |
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| Server Address | Your VoIP service provider must host a STUN server in order for you to use STUN. |
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| Type the IP address or domain name (up to 127 ASCII characters) of the STUN |
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| server in this field. |
| 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 |
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| Active | Check this box to use a NAT router’s public IP address and SIP port number in the |
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| Prestige’s SIP messages. This eliminates the need for STUN or a SIP ALG. You |
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| must also configure the NAT router to forward traffic with this port number to the |
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| Prestige. |
| Server 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 |
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| Active | Check this box if your VoIP service provider has a SIP outbound server to handle |
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| 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 any SIP ALG on a NAT router |
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| in 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. |
| NAT Keep Alive |
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| 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. |
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| |
| Frequency |
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| (DTMF) |
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| 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 |
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| Waiting Indication) |
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Chapter 8 VoIP Screens | 108 |