ZyXEL P-2812HNU-F1 User Guide - Page 229
Phone Screen
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Chapter 16 VoIP Each field is described in the following table. Table 63 VoIP > SIP > Common LABEL DESCRIPTION Bound Interface Name Bound Interface Name If you select AnyWAN, the Device automatically activates the VoIP service when any WAN connection is up. RFC Support PRACK (RFC 3262) If you select MultiWAN, you also need to select the pre-configured WAN connections. The VoIP service is activated only when one of the selected WAN connections is up. RFC 3262 defines a mechanism to provide reliable transmission of SIP provisional response messages, which convey information on the processing progress of the request. This uses the option tag 100rel and the Provisional Response ACKnowledgement (PRACK) method. Select Supported or Required to have the Device include a SIP Require/ Supported header field with the option tag 100rel in all INVITE requests. When the Device receives a SIP response message indicating that the phone it called is ringing, the Device sends a PRACK message to have both sides confirm the message is received. If you select Supported, the peer device supports the option tag 100rel to send provisional responses reliably. If you select Required, the peer device requires the option tag 100rel to send provisional responses reliably. Session Timer (RFC 4028) Apply Cancel Select Disabled to turn off this function. Select this to have the Device support RFC 4028. This makes sure that SIP sessions do not hang and the SIP line can always be available for use. Click Apply to save your changes. Click Cancel to return to the previous screen without saving. 16.6 Phone Screen Use this screen to control which SIP accounts and PSTN line each phone uses. Click VoIP > Phone to access the Phone Device screen. Figure 104 VoIP > Phone > Phone Device P-2812HNU(L)-Fx Series User's Guide 229