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Specifying the H.323 Gatekeeper
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The Microsoft H.323 TSP incorporates H.323 gatekeeper support. A gatekeeper is a server in a network that manages client access to telephony services. A gatekeeper provides address resolution, call routing, call logging, and other services to other computers within the local communications network, or to external users. Use Phone and Modem Options to specify the name or IP address of the gatekeeper, log-on credentials (phone number or account name), and timeout and port values. To configure the H.323 gatekeeper 1. In Control Panel, click Phone and Modem Options. 2. Click the Advanced tab, and then select Microsoft H.323 Telephony Service Provider. 3. Click Configure. Select the Use H.323 gatekeeper check box, and then type the name or IP address of the H.323 gatekeeper in the corresponding text box. If they are needed, you can enter nondefault values in the text boxes for both the H.323 Call Alerting timeout and H.323 Call Listening Port.
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A directory service can be used to facilitate the process of making H.323-based IP telephony calls. The directory service provides transparent translation from either a user name or computer name to the associated IP address. For example, if you enter a known user name or computer name when making a call through an H.323-based IP telephony application, the directory service translates the information to an IP address. You can also use the directory service to publish IP multicast conferences. Windows XP Professional uses a combination of the Lightweight Directory Access Protocol (LDAP) directory service and Active Directory for H.323-based IP telephony calls. The Internet Locator Service (ILS) of Microsoft Site Server is another directory service that can be used with TAPI applications on Windows 2000 based or Windows Server 2003 based computers. This service is distinct from Active Directory in that it is less scalable and does not provide persistent, centrally administered data storage.
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Troubleshooting Telephony and Conferencing
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You can use the following techniques and procedures to determine and resolve problems within telephony applications and in telephony device configuration, as well as problems with H.323 and multicast conferencing.
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The following sections detail troubleshooting procedures for analog and ISDN modems.
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26:
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Configuring Telephony and Conferencing
An analog or ISDN modem is not listed If your modem is not on the Windows XP Professional Hardware Compatibility List (HCL) or is not detected by the Add Hardware Wizard, use one of the following procedures to install it:
Check the modem. If it is an external modem, make sure it is turned on and that all cables are tightly connected. If the modem is internal, verify that it is properly installed. If the modem is a Plug and Play device, open Device Manager in Control Panel and select Scan for hardware changes on the Action menu to reinstall the modem. To open Device Manager, open Control Panel and then double-click System. Click the Hardware tab, and then click Device Manager. If the modem is not a Plug and Play device, reinstall the modem using Add Hardware.
Obtain an .inf (installation) file from the modem manufacturer specifically for Windows XP Professional. Follow the manufacturer s instructions for installing the modem in Windows XP Professional, or contact the modem manufacturer for assistance. Install your modem as a standard modem by using the Add Hardware Wizard. This option provides basic dialing and connectivity support for the modem, although manufacturer-specific features might be unavailable.
Application cannot dial selected modem If you cannot use an application to dial your modem, test the modem to verify that Windows XP Professional can connect to it. In the Phone and Modem Options dialog box, select the Modems tab, click Properties for the modem you want, and then select the Diagnostics tab. Click Query Modem to send a set of AT commands to the modem. If the modem response is not displayed in the Response area, perform the following steps to diagnose the problem:
If an external modem is experiencing problems, make sure that the serial cable connection between the computer and the modem is secure and that the cable is not broken or frayed. Verify that Windows XP Professional recognizes your COM ports by displaying Device Manager. Verify that the COM port is not experiencing a hardware or resource problem (identified by an exclamation point icon next to the device listing) or has been disabled (identified by the international No symbol). If the connected port is listed without any additional icons, the COM port is recognized and available.
If the COM port is disabled in Device Manager, a hardware or configuration problem is likely. Use the following steps to troubleshoot the problem for an external modem:
Verify that the port is not disabled in the BIOS (also called the CMOS) setup of the computer. Refer to the documentation for your computer to obtain information about configuring options in the BIOS setup.
Part IV:
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