ZyXEL P-2812HNU-51c User Guide - Page 224
The SIP Account Screen
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Chapter 16 VoIP Table 60 VoIP > SIP > SIP Service Provider (continued) LABEL DESCRIPTION T38 Fax Relay Select this if the Device should send fax messages as UDP or TCP/IP packets through IP networks. This provides better quality, but it may have interoperability problems. The peer devices must also use T.38. Outbound Proxy Enable Select this if your VoIP service provider has a SIP outbound server to handle voice calls. This allows the Device to work with any type of NAT router and eliminates the need for STUN or a SIP ALG. Turn off any SIP ALG on a NAT router in front of the Device to keep it from re-translating the IP address (since this is already handled by the outbound proxy server). Server Address Enter the IP address or domain name of the SIP outbound proxy server. Server Port Enter the SIP outbound proxy server's listening port, if your VoIP service provider gave you one. Otherwise, keep the default value. QoS Tag SIP TOS Priority Setting Enter the DSCP (DiffServ Code Point) number for SIP message transmissions. The Device creates Class of Service (CoS) priority tags with this number to SIP traffic that it transmits. RTP TOS Priority Setting Enter the DSCP (DiffServ Code Point) number for RTP voice transmissions. The Device creates Class of Service (CoS) priority tags with this number to RTP traffic that it transmits. Timer Setting Expiration Duration Enter the number of seconds your SIP account is registered with the SIP register server before it is deleted. The 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 Re-send Enter the number of seconds the Device waits before it tries again to register the timer SIP account, if the first try failed or if there is no response. Session Expires Enter the number of seconds the Device lets a SIP session remain idle (without traffic) before it automatically disconnects the session. Min-SE Enter the minimum number of seconds the 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 Device accepts. Dialing Interval Selection Dialing Interval Selection Enter the number of seconds the Device should wait after you stop dialing numbers before it makes the phone call. The value depends on how quickly you dial phone numbers. PSTN Fail Over ("L" models only) Select this check box if you want to redirect the outgoing calls to the PSTN line (that do not use the Internet) when your SIP account is unregistered or SIP call has failed. Apply Click Apply to save your changes. Cancel Click Cancel to restore your previously saved settings. 16.3 The SIP Account Screen The Device uses a SIP account to make outgoing VoIP calls and check if an incoming call's destination number matches your SIP account's SIP number. In order to make or receive a VoIP call, you need to enable and configure a SIP account, and map it to a phone port. The SIP account contains information that allows your Device to connect to your VoIP service provider. 224 P-2812HNU(L)-Fx Series User's Guide