ZyXEL MAX-306 User Guide - Page 154
VOICE > Service Configuration > SIP Settings > Advanced continued, Table 57
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Chapter 12 The Service Configuration Screens Table 57 VOICE > Service Configuration > SIP Settings > Advanced (continued) LABEL DESCRIPTION Expiration Duration Enter the number of seconds your SIP account is registered with the SIP register server before it is deleted. The WiMAX Device automatically tries to re-register your SIP account when one-half of this time has passed. (The SIP register server might have a different expiration.) Register Resend timer Enter the number of seconds the WiMAX Device waits before it tries again to register the SIP account, if the first try failed or if there is no response. Session Expires Enter the number of seconds the conversation can last before the call is automatically disconnected. Usually, when one-half of this time has passed, the WiMAX Device or the other party updates this timer to prevent this from happening. Min-SE Enter the minimum number of seconds the WiMAX Device accepts for a session expiration time when it receives a request to start a SIP session. If the request has a shorter time, the WiMAX Device rejects it. RTP Port Range Start Port End Port Enter the listening port number(s) for RTP traffic, if your VoIP service provider 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: • Type the port number at the beginning of the range in the Start Port field • Type the port number at the end of the range in the End Port field. Voice Compression Primary, Secondary, and Third Compression Select the type of voice coder/decoder (codec) that you want the WiMAX Device to use. G.711 provides high 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.723 provides good voice quality, and requires 20 or 40 kbps. • G.729 requires only 8 kbps. The WiMAX Device must use the same codec as the peer. When two SIP devices start a SIP session, they must agree on a codec. DTMF Mode For more on voice compression, see Voice Coding on page 152 Control how the WiMAX Device handles the tones that your telephone makes when you push its buttons. You should use the same mode your VoIP service provider uses. STUN • 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) can distort the tones. • SIP INFO - send the DTMF tones in SIP messages 154 User's Guide