Elements of the SMS class are defined in three namespaces: Email, Email2, and AirSyncBase. The namespace in which an element is defined is indicated by the presence of a namespace prefix, as defined in section 2.2.1.
The XML schema elements that are specific to the SMS class are specified in section 184.108.40.206. Additional XML schema elements that are used for the SMS class are specified in section 220.127.116.11. Elements that are specific to a particular operation are specified further in sections 3.1.4, 3.1.5, and 3.2.5.
The SMS class is supported only by protocol versions 14.0 and 14.1. Therefore, the elements that are defined by this specification MUST be used with protocol version 14.0 or 14.1 for any operation involving the SMS class.