2.1 Transport

The commands specified by this protocol are sent to and received from the server by using the underlying ROP request buffers and ROP response buffers, respectively, as specified in [MS-OXCROPS].

Asynchronous calls are made on the server by using RPC transport, as specified in [MS-OXCRPC], and the MAPI extensions to HTTP<1>, as specified in [MS-OXCMAPIHTTP].

UDP datagrams are sent from server to client by using the User Datagram Protocol (UDP), as specified in [RFC768]. For more information, see [MSDN-WS2].