Chapter 11 Voice
Table 54 VoIP > SIP Settings > Advanced
LABEL | DESCRIPTION |
URL Type | Select whether or not to include the SIP service domain name when the ZyXEL |
| Device sends the SIP number. |
| SIP - include the SIP service domain name. |
| 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 |
| your SIP account when |
| 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 |
| (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 | |
| remain idle (without traffic) before it automatically disconnects the session. When |
| two SIP devices start a SIP session, they must agree on an expiration time for idle |
| 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. |
| To enter one port number, enter the port number in the Start Port and End Port |
| fields. |
| To enter a range of ports, |
| • enter the port number at the beginning of the range in the Start Port field. |
| • 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). |
| • G.711A is typically used in Europe. |
| • G.711u is typically used in North America and Japan. |
| G.726 operates at 16, 24, 32 or 40 kbps. |
| By contrast, G.729 only requires 8 kbps. |
| The ZyXEL Device must use the same codec as the peer. When two SIP devices |
| 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 |
| when you push its buttons. You should use the same mode your VoIP service |
| provider uses. |
| RFC 2833 - send the DTMF tones in RTP packets. |
| PCM - send 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 and G.726) can distort the tones. |
| SIP INFO - send the DTMF tones in SIP messages. |
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Outbound Proxy |
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