2The IP Softphone is designed to interwork with a Panasonic Hybrid-IP PBX (KX-TDAseries), and enables the personal computer to handle calls instead of the proprietarytelephone.Conditions• In some cases, clear communication may not be possible, due to network conditions andthe specifications of the PC and headset. Confirm that CO line and intercom calls can becompleted successfully using the IP Softphone's Trial Mode before registering a license. Aregistered license cannot be used at another PC.• The feature specifications of the IP Softphone are basically the same as those for the KX-NT136 IP proprietary telephone. For installation and operation instructions, refer to thedocumentation for the KX-NT136.The feature differences from KX-NT136 are as follows:– Programmable melodies and ring tones are not available.– Automatic Redial is available only for ISDN lines.• To install the IP Softphone on, or to uninstall it from a PC running Windows XPProfessional SP2, you should be in the group “Administrators”. The user in any othergroups is not authorized.• If audio becomes increasingly delayed the longer you use IP Softphone, there may be aproblem with the PC's audio driver. In this case, install another compatible audio driver (notanother version of the same driver).• If using Windows Firewall, you may not hear a dial tone when clicking the SP-PHONEbutton. In this case, select the “software_ippt” check box in the exceptions list for WindowsFirewall.• The Automatic Pop-up feature does not operate in situations such as the following:– When a call is answered automatically– When using Live Call Screening in hands-free mode• Specifications are subject to change without notice.• The design of the final software may differ slightly from the screenshots shown in thismanual.Introduction