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| Chapter 11 Voice |
| Table 62 VoIP > SIP Settings > Advanced | |
| LABEL | DESCRIPTION |
| URL Type | Select whether or not to include the SIP service domain name when the ZyXEL |
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| Device sends the SIP number. |
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| SIP - include the SIP service domain name. |
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| TEL - do not include the SIP service domain name. |
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| Expiration | Enter the number of seconds your SIP account is registered with the SIP register |
| Duration | server before it is deleted. The ZyXEL Device automatically tries to |
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| your SIP account when |
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| might have a different expiration.) |
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| Register | Enter the number of seconds the ZyXEL Device waits before it tries again to |
| timer | register the SIP account, if the first try failed or if there is no response. |
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| Session Expires | Enter the number of seconds the ZyXEL Device lets a SIP session remain idle |
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| (without traffic) before it automatically disconnects the session. |
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| Enter the minimum number of seconds the ZyXEL Device lets a SIP session | |
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| remain idle (without traffic) before it automatically disconnects the session. When |
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| two SIP devices start a SIP session, they must agree on an expiration time for idle |
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| sessions. This field is the shortest expiration time that the ZyXEL Device accepts. |
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| RTP Port Range |
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| Start Port | Enter the listening port number(s) for RTP traffic, if your VoIP service provider |
| End Port | gave you this information. Otherwise, keep the default values. |
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| To enter one port number, enter the port number in the Start Port and End Port |
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| fields. |
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| To enter a range of ports, |
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| • enter the port number at the beginning of the range in the Start Port field. |
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| • enter the port number at the end of the range in the End Port field. |
| Voice | Select the type of voice coder/decoder (codec) that you want the ZyXEL Device to |
| Compression | use. G.711 provides higher voice quality but requires more bandwidth (64 kbps). |
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| • G.711A is typically used in Europe. |
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| • G.711u is typically used in North America and Japan. |
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| G.726 operates at 16, 24, 32 or 40 kbps. |
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| By contrast, G.729 only requires 8 kbps. |
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| The ZyXEL Device must use the same codec as the peer. When two SIP devices |
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| start a SIP session, they must agree on a codec. |
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| Primary | Select the ZyXEL Device’s first choice for voice coder/decoder. |
| Compression |
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| Type |
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| Secondary | Select the ZyXEL Device’s second choice for voice coder/decoder. Select None if |
| Compression | you only want the ZyXEL Device to accept the first choice. |
| Type |
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| Third | Select the ZyXEL Device’s third choice for voice coder/decoder. Select None if |
| Compression | you only want the ZyXEL Device to accept the first or second choice. |
| Type |
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| DTMF Mode | Control how the ZyXEL Device handles the tones that your telephone makes |
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| when you push its buttons. You should use the same mode your VoIP service |
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| provider 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 and G.726) can distort the tones. |
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| SIP INFO - send the DTMF tones in SIP messages. |
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| Outbound Proxy |
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| 181 |
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