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Microsoft Windows Logo Program System and Device Requirements  —  120

B6. Telephony applications provided with a system meet industry telephony performance requirements

If the system enables telephony applications that support devices, such as speakerphone or handset telephony, using various types of connections, such as plain old telephone service (for example, through a voice modem) or IP (through a network connection), the applications provided with the system must comply with telecommunications industry requirements for such parameters as send and receive loudness, echo, and so forth.

Speakerphone applications must meet the requirements in ITU-T Recommendation P.340, Transmission characteristics of hands-free telephones. Other applications must meet the requirements in ITU-T Recommendation P.310, Transmission characteristics for telephone band (300-3400 Hz) digital telephones. For additional information for IP telephony functions, see U.S. Committee T1 Technical Report No. 56, Performance guidelines for voiceband services over hybrid internet/PSTN connections, which provides useful guidance for IP telephony functions.

Note: There is no requirement to support any ITU recommendation equivalent to TIA-3800 for the testing of pulse-coded modulation (PCM) modem operation.

B6.1.4.10 Data modem supports digital connection to support host-side V.90 operation

V.90 depends on a digital connection for the host-side modem to the public telephone network, typically using T1 or ISDN. Server modems should be designed for digital connection, to support host side V.90, where digital connections are available.

B6.1.5 General Modem - FAQs

B6.1.5.1 Current Modem FAQs

See http://www.microsoft.com/winlogo/hardware/.

B6.1.5.2 DELETED

Modems are not required on any system. FAQ Date: January 31, 2001

B6.1.5.3 Unimodem required commands [Clarification]

See B6.

B6.1.5.4 Voice recording and playback capabilities [Logo Program correction]

The FAQ is incorporated at B6.

B6.1.5.5 DELETED
B6.1.5.6 WDM support for driver-based modems [Logo Program clarification]

See B6.1.1.5

B6.1.5.7 Total execution time for DPCs queued by a WDM modem [Clarifications]

Note: Total execution time for DPCs is a recommendation. This is not tested.

At any instant in time, the total execution time for all delayed procedure calls (DPCs) that have been queued by a WDM driver-based modem, but have not dequeued and started executing, should not exceed 500 milliseconds.

© 1999-2002 Microsoft Corporation. All rights reserved.

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