Advanced Phone - ZyXEL Communications P-27xx Series User Manual

Chapter 3 Phone Use and Configuration
3.3 Advanced Phone Configuration
Click VoIP > SIP to open the SIP Settings screen. This screen allows you to
manage up to two SIP accounts.
Figure 3 The SIP Settings Screen
To have the ZyXEL Device add a "user=phone" parameter to the SIP URI before
sending a SIP INVITE request, select the Enable option next to Set User Header
To Phone. This parameter indicates the user part of the SIP URI
(<user>@<sipserver>) the ZyXEL Device is calling is a valid telephone number.
If you need to send fax messages using T.38 and want to always use the same
port number for both transmitted and received T.38 packets, select Use Original
RTP Port. Otherwise, select Assign Port for Reinvite to have the ZyXEL Device
choose a port randomly for T.38 after the re-invite process.
Click Apply to save the changes you made in this screen.
Select Active for the phone you want to configure, then click the Modify icon. The
Phone SIP Settings screen opens, where you can set up and maintain your SIP
account(s) in the ZyXEL Device. Your VoIP or Internet service provider should
provide you with your account information.
16
P-27XX Series User's Guide