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3.1.8 Versioning Negotiation

  • Article

This protocol has two versions: MS-DTCM 1.0 and MS-DTCM 1.1. Before exchanging any protocol messages, the two protocol participants MUST agree on what protocol version to use in their message exchange.

To negotiate a common protocol version, the two protocol participants MUST use the version negotiation mechanism that is provided by [MS-CMPO] section 3.3.4.2 as follows:

  • At initialization, each of the protocol participants set their Maximum Level 3 Version Number data field as specified in Common Initialization Details.

  • When a session is established between two protocol participants, the value of the dwLevelThreeAccepted field of the Session object's version field (as specified in [MS-CMPO] section 3.2.1.2) indicates the negotiated protocol version as follows:

    • If the value of the dwLevelThreeAccepted field is less than or equal to 3:

      • The negotiated protocol version is MS-DTCM 1.0.

    • Otherwise:

      • The negotiated protocol version is MS-DTCM 1.1.

The negotiated protocol version MUST be used when creating new connection objects, as specified in Common Initialization Details (section 3.1.3).