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One or more clients cannot find a line for the telephony server If one or more client computers cannot find the lines for a telephony server, it might be because they cannot be authorized for access to lines on the telephony server. When a TAPI application first accesses lines on the telephony server, the user context associated with the application process is authenticated. This means that those lines must have been configured on the server to allow access by that client. Contact the system administrator for the server. After the lines have been configured, the new settings are not available until TAPI restarts on the client. Stop all client TAPI applications, and restart Windows XP Professional. When the client applications restart, they can find the newly assigned lines. An application fails to start after you have canceled the Location Information dialog box If an application fails to start after you have canceled the Location Information dialog box, the problem might be that address translation required by TAPI applications has not been specified. Use the Location Information dialog box to enter your country/region code, local area code, and pulse or tone and external line access settings. A client cannot find a new line even though the server administrator has assigned the line to the client When you assign a currently running client to a line on the telephony server, the new settings are not available until TAPI restarts on the client. Stop all client TAPI applications so that TAPI shuts down. When the client applications restart, they can find the newly assigned lines.

Microsoft Visual C# 2008 Express Edition: Build a Program Now!

Users of H.323 or multicast conferencing might encounter problems connecting with other users or receiving audio or video. Audio problems in conferencing applications If audio problems occur in H.323 or multicast video conferences, the microphones or sound cards on the clients might be incorrectly configured or malfunctioning. To diagnose sound hardware on Windows XP Professional based computers, start the Sound Recorder application. In Accessories, point to Entertainment, and then click Sound Recorder. You can also open Sound Recorder by typing sndrec32 at the command prompt. Make a recording of your own voice using Sound Recorder, and then play it back. If there is no sound, make sure that the microphone is properly plugged in.

Part IV:

Introducing Firewalls Understanding Internet Connection Firewall Activating and Configuring ICF 117

If the Sound Recorder test works properly but you continue to have audio problems, verify the sound settings by using Volume Control. To verify sound settings by using Volume Control 1. In Accessories, point to Entertainment, and then click Volume Control. 2. In the Options menu, click Properties, and then click Playback. Make sure that the Wave and Microphone check boxes are selected. You might have to scroll the list to see these settings. 3. Click OK. 4. Select the Mute check box in the Microphone column if it is not checked. This prevents speech from being echoed locally (played back on the speaker s computer). 5. If the voices of all other conference participants are too loud or too quiet, adjust the Volume Control or Wave sliders downward or upward as needed. 6. On the Options menu, click Properties, and then click Recording. Select all the check boxes in the list at the bottom of the dialog box. You might have to scroll the list to see these settings. 7. Click OK. 8. Select the Mute check boxes in all the columns except for the Microphone column if they are not already checked. Make sure that the Mute check box in the Microphone column is not selected. This allows your speech to be sent to the conference, but doing so also prevents other sounds, including those of other conference participants, from being transmitted from your computer. 9. If other conference participants are dissatisfied with the level of sound, adjust the Microphone slider downward or upward as needed. Note

A single incorrectly configured computer can cause audio problems or echoes for all other conference participants.

If you continue to encounter audio problems after adjusting the sound settings, make sure that the affected computers have full-duplex sound cards. Full-duplex sound cards can capture and play audio simultaneously, while half-duplex sound cards can capture and play only one at a time. Most modern sound cards are full-duplex, but many older sound cards are only half-duplex. To check whether the sound card on your computer supports full-duplex audio, start Sound Recorder and record a speech sample for approximately 30 seconds. After this is complete, open a second instance of Sound Recorder. Play the sample you recorded using the first

It seems as though hacker attacks and other malicious behavior over the Internet are quite common these days. The evening news often reports some new online threat that has appeared, and even large corporations with extensive security have fallen prey to hackers and security breaks. With security becoming more and more of an issue when accessing the Internet, attention has moved to the home and small office user as well. With always-on, always-connected broadband solutions growing in use, the potential for security problems is very real. To help combat these problems and provide a safer way to access the Internet, Microsoft Windows XP introduces Internet Connection Firewall (ICF), a tool designed for the home user, home network, or small office network that helps protect a computer or network from security threats originating from the Internet. This chapter covers the basics of activating and configuring ICF to protect your Windows XP computer from external attack.

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