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SMPP V5.0 SMS Forum 2 of 166 www.smsforum.net SMS FORUM Table Of Contents 1 Introduction .................................................................................................................12 1.1 Scope Of This Document ........................................................................................13 1.2 Glossary ..................................................................................................................13 1.3 References ..............................................................................................................14 1.4 SMPP Overview ......................................................................................................16 1.4.1 Protocol Versions.............................................................................................17 1.4.2 Supported Cellular Technologies.....................................................................18 1.4.3 Typical Applications of SMPP ..........................................................................19 1.4.4 SMPP Sessions ...............................................................................................20 1.4.5 Protocol Operations and PDUs........................................................................21 1.4.5.1 Session Management Operations ............................................................21 1.4.5.2 Message Submission Operations.............................................................22 1.4.5.3 Message Delivery Operations...................................................................23 1.4.5.4 Message Broadcast Operations ...............................................................23 1.4.5.5 Anciliary Submission Operations..............................................................23 1.4.5.6 Anciliary Broadcast Operations ................................................................24 2 SMPP Sessions ..........................................................................................................25 2.1 Application Layer Communication...........................................................................25 2.2 Establishing a SMPP Session.................................................................................26 2.3 Session States ........................................................................................................26 2.3.1 Open.................................................................................................................26 2.3.2 Bound_TX ........................................................................................................26 2.3.3 Bound_RX........................................................................................................27 2.3.4 Bound_TRX......................................................................................................27 2.3.5 Unbound...........................................................................................................28 2.3.6 Closed ..............................................................................................................28 2.3.7 Outbound .........................................................................................................28 2.4 Operation Matrix......................................................................................................29 2.5 Sample Sessions.....................................................................................................31 2.5.1 Example Transmitter Session ..........................................................................31 2.5.2 Example Receiver Session ..............................................................................32 2.5.3 Example Transceiver Session .........................................................................33 2.5.4 Example Transmitter Session (Cell Broadcast Entity).....................................34 2.5.5 Example Outbind Session................................................................................35 2.6 PDU Sequencing.....................................................................................................36 2.6.1 The PDU Sequence Number ...........................................................................36 2.6.2 Why use Monotonically Increasing Sequence numbers?................................37 2.6.3 Sequence Numbers Across Sessions .............................................................37 2.6.4 Synchronous Vs. Asynchronous......................................................................37 2.6.5 Why Asynchronous? ........................................................................................39 2.7 Session Timers........................................................................................................40 2.8 Error Handling .........................................................................................................41 2.8.1 Handling Connection Failure............................................................................41 2.8.2 Operation Failure .............................................................................................42 2.9 Flow Control and Congestion Avoidance................................................................43 2.10 Session Security and Encryption.........................................................................44 2.10.1 Leased Lines....................................................................................................45 2.10.2 Secure Transport Layer ...................................................................................45 2.10.3 Secure VPN .....................................................................................................45 2.10.4 Secure Tunnel..................................................................................................46 2.11 Forward and Backward Compatibility..................................................................47 2.11.1 Forward Compatibility ......................................................................................47 2.11.2 Backward Compatibility....................................................................................48 3 SMPP Parameter and PDU Format............................................................................49 3.1 Parameter Type Definitions.....................................................................................49 3.1.1 NULL Settings ..................................................................................................51 3.1.2 SMPP Parameter Field Size Notation..............................................................52 SMPP V5.0 SMS Forum 3 of 166 www.smsforum.net SMS FORUM 3.2 General PDU Format...............................................................................................53 3.2.1 PDU Format .....................................................................................................53 3.2.1.1 Command_length......................................................................................53 3.2.1.2 Command_id.............................................................................................54 3.2.1.3 Command_status......................................................................................54 3.2.1.4 Sequence_number....................................................................................54 3.2.1.5 Standard Parameters................................................................................54 3.2.1.6 TLV Parameters ........................................................................................54 3.2.2 A sample PDU..................................................................................................55 4 SMPP PDU Definitions................................................................................................56