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7 Appendix B: Product Behavior

  • Article

The information in this specification is applicable to the following Microsoft products or supplemental software. References to product versions include updates to those products.

The terms "earlier" and "later", when used with a product version, refer to either all preceding versions or all subsequent versions, respectively. The term "through" refers to the inclusive range of versions. Applicable Microsoft products are listed chronologically in this section.

Windows Client

  • Windows 98 operating system

  • Windows NT 4.0 operating system

  • Windows 2000 Professional operating system

  • Windows XP operating system

  • Windows Vista operating system

  • Windows 7 operating system

  • Windows 8 operating system

  • Windows 8.1 operating system

  • Windows 10 operating system

  • Windows 11 operating system

Windows Server

  • Windows 98

  • Windows NT 4.0

  • Windows 2000 Server operating system

  • Windows Server 2003 operating system

  • Windows Server 2008 operating system

  • Windows Server 2008 R2 operating system

  • Windows Server 2012 operating system

  • Windows Server 2012 R2 operating system

  • Windows Server 2016 operating system

  • Windows Server operating system

  • Windows Server 2019 operating system

  • Windows Server 2022 operating system

  • Windows Server 2025 operating system

Exceptions, if any, are noted in this section. If an update version, service pack or Knowledge Base (KB) number appears with a product name, the behavior changed in that update. The new behavior also applies to subsequent updates unless otherwise specified. If a product edition appears with the product version, behavior is different in that product edition.

Unless otherwise specified, any statement of optional behavior in this specification that is prescribed using the terms "SHOULD" or "SHOULD NOT" implies product behavior in accordance with the SHOULD or SHOULD NOT prescription. Unless otherwise specified, the term "MAY" implies that the product does not follow the prescription.

<1> Section 1.3: The default behavior of Windows clients is connection-less unless explicitly configured to be connection-oriented. Applicable Windows Server releases support both connection-oriented and connection-less clients.

<2> Section 1.5: By default, a Windows-based computer is not configured to act as a client for the Telephony Remote Protocol. The default, when enabled, is to act as a connection-less client.

<3> Section 1.7: The following table lists the TAPI version and the Windows versions in which they are supported:

TAPI version

Distribution

1.4

Supported in Windows.

2.0

Supported in Windows NT 4.0 operating system Service Pack 3 (SP3), Windows 2000 Professional and later, and Windows 2000 Server and later.

2.1

Supported in Windows 98, Windows NT 4.0 operating system Service Pack 4 (SP4), Windows 2000 Professional and later, and Windows 2000 Server and later.

2.2

Not supported in Windows 98 and Windows NT 4.0.

3.0

Not supported in Windows 98 and Windows NT 4.0.

3.1

Not supported in Windows 98, Windows NT 4.0, and Windows 2000 operating system.

<4> Section 2.1: Both client and server use RPC_C_AUTHN_GSS_NEGOTIATE for authentication in Windows 7 and later, and in Windows Server 2008 R2 and later.

<5> Section 3: Automatic detection of servers is not supported in: Windows 98, Windows NT 4.0, and Windows 2000.

<6> Section 3.1.4.1: Both client and server use authentication level RPC_C_AUTHN_LEVEL_PKT_PRIVACY for ClientAttach and RemoteSPAttach, respectively, based on the version of Windows that supports this level of authentication:

  • Windows XP operating system Service Pack 2 (SP2)

  • Windows Server 2003 operating system with Service Pack 1 (SP1)

  • Windows Vista and later.

  • Windows Server 2008 and later.

  • Windows 2000, Windows XP, and Windows Server 2003 use the default authentication level provided by that platform.

<7> Section 3.1.5: Default time-out is 30 milliseconds for timers.

<8> Section 3.2.6: The default polling interval is 5 minutes.

<9> Section 3.2.6: The default value is 1 second for time-out, and the number of retries is 2.

<10> Section 3.3.4.1: Starting with Windows Server 2003 with SP1, the client and server reject unencrypted packets. The authentication-level constant RPC_C_AUTHN_LEVEL_PKT_PRIVACY is required for a client/server connection to succeed.

<11> Section 5.1: Both client and server use the authentication level RPC_C_AUTHN_LEVEL_PKT_PRIVACY for ClientAttach and RemoteSPAttach, respectively, based on the version of Windows that supports this level of authentication:

  • Windows XP SP2

  • Windows Server 2003 with SP1

  • Windows Vista and later.

  • Windows Server 2008 and later.

  • Windows 2000, Windows XP, and Windows Server 2003 use the default authentication level that is provided by that platform.