Phone Screen - ZyXEL Communications P-2812HNU-51c User Manual

Each field is described in the following table.
Table 63 VoIP > SIP > Common
LABEL
Bound Interface Name
Bound Interface
Name
RFC Support
PRACK (RFC
3262)
Session Timer
(RFC 4028)
Apply
Cancel

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
DESCRIPTION
If you select AnyWAN, the Device automatically activates the VoIP service when
any WAN connection is up.
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.
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.
Chapter 16 VoIP
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