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| Table 61 VoIP > SIP > SIP Settings > Advanced | |
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| LABEL | DESCRIPTION |
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| DTMF Mode | Control how the ZyXEL Device handles the tones that your telephone makes when |
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| you push its buttons. You should use the same mode your VoIP service provider |
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| uses. |
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| RFC 2833 - send the DTMF tones in RTP packets |
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| PCM - send the DTMF tones in the voice data stream. This method works best |
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| when you are using a codec that does not use compression (like G.711). Codecs |
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| that use compression (like G.729) can distort the tones. |
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| SIP INFO - send the DTMF tones in SIP messages |
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| Note: In order to use the VoiP trunking feature you must set DTMF |
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| Mode to SIP INFO. |
| STUN |
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| Active | Select this if all of the following conditions are satisfied. |
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| • There is a NAT router between the ZyXEL Device and the SIP server. |
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| • The NAT router is not a SIP ALG. |
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| • Your VoIP service provider gave you an IP address or domain name for a |
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| STUN server. |
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| Otherwise, clear this field. |
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| Server Address | Enter the IP address or domain name of the STUN server provided by your VoIP |
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| service provider. |
| Server Port | Enter the STUN server’s listening port, if your VoIP service provider gave you one. |
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| Otherwise, keep the default value. |
| Use NAT |
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| Active | Select this if you want the ZyXEL Device to send SIP traffic to a specific NAT |
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| router. You must also configure the NAT router to forward traffic with the specified |
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| port to the ZyXEL Device. This eliminates the need for STUN or a SIP ALG. |
| Server Address | Enter the public IP address or domain name of the NAT router. |
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| 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 | Select this if your VoIP service provider has a SIP outbound server to handle voice |
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| calls. This allows the ZyXEL Device 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 ZyXEL Device to keep it from retranslating the IP address (since this |
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| is already handled by the outbound proxy server). |
| Server Address | Enter the IP address or domain name of the SIP outbound proxy server. |
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| Server Port | Enter the SIP outbound proxy server’s listening port, if your VoIP service provider |
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| gave you one. Otherwise, keep the default value. |
| NAT Keep Alive |
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| Active | Select this to stop NAT routers between the ZyXEL Device and SIP server (a SIP |
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| proxy server or outbound proxy server) from dropping the SIP session. The ZyXEL |
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| Device does this by sending SIP notify messages to the SIP server based on the |
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| specified interval. |
| Keep Alive with | Select this if the SIP server is a SIP proxy server. |
| SIP Proxy |
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| Keep Alive with | Select this if the SIP server is an outbound proxy server. You must enable |
| Outbound Proxy | Outbound Proxy to use this. |
Chapter 9 SIP | 151 |