Voice Services
4.4Changing the IP Address
To make the login IP address easy to remember, you can change the IP address after logging in to the Web configuration page.
To change the IP address, do as follows:
Step 1 Choose Basic > LAN in the navigation tree.
Step 2 Enter a new IP address as desired in the IP address text box. Step 3 Enter a subnet mask in the Subnet mask text box.
Step 4 Click Submit to save the settings.
z To log in to the Web configuration page after you change the IP address successfully, you need to launch the Internet Explorer, and then enter the new IP address in the address bar.
zEnsure that the IP address of the computer is in the same network segment as that of the HG552a1.
4.5Restoring Default Settings
You can quickly restore the default settings of the HG552a1 by pressing the RESET button. To restore the default settings, press and hold the RESET button for over six seconds after the HG552a1 is powered on, and then release the button.
In addition, you can restore the default settings of the HG552a1 through the Web configuration page.
To restore the default settings through the Web configuration page, do as follows: Step 1 Log in to the Web configuration page.
Step 2 Choose Maintenance > Device.
Step 3 Click Restore Default Settings.
After the preceding operations, the page jumps to the login page. You can log in to the Web configuration page by entering the default user name and password that are telekom.
5Voice Services
5.1Introduction
The HG552a1 supports voice services based on the Session Initiation Protocol (SIP).
The SIP is an application layer protocol used to create, modify, or end multimedia sessions. Based on text coding, the SIP references the Hyper Text Transport Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP), and can cooperate with other protocols, such as the
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