Instructions:

To restore default settings on the Alti-IP 600H phone:

Press * * 7, then press the Enter button.

Press * * 2, then press the Enter button.

To restore default settings on the IP705, IP710, and IP720 phones:

Press the Menu button.

Press * * 2, then press the Enter button.

To reboot all IP phones:

Press * * 3, then press the Enter button.

Note:  When the phone is rebooted, the AltiWare IP address setting
    reverts to the original configuration.