UCP Server for SMSCUniversal Computer Protocol

Server for

Short Messaging Service Center

A project report Submitted by

NETAJI RAO DUMPALARegd. No.: 94036304.

Introduction

Introduction

MO – MTAO – MTMO – ATAO – AT

Types of short messages

AO : Application OriginatedMO : Mobile OriginatedAT : Application TerminatedMT : Mobile Terminated

Position of the UCP Server

EMI – External Machine InterfaceESME – External Short Message EntitySMSC – Short Messaging Service CenterPLMN – Public Land Mobile Network

From the SMSC view, EMI is nothing but the UCP Server

What UCP Server does?

The objective of the UCP server is to accept short message data from the ESME (External Short Message Entity) and forward it to SMSC and vice versa.

To an ESME, the UCP server has to provide access to the SMSC functions like

Submission of Short MessagesReception of Short MessagesReception of Notifications related to submitted Short MessagesOperate on submitted Short Messages: query, delete and modify.

UCP packet structure

E.g.: stx03/00107/O/51/01727654321/12345/55555/1/01724444444//0100////////////3//4432204D657373616765/////////////99etx

Here stx = 02(hex) and etx = 03(hex).

stx <header> / <data> / <checksum> etx

As separator between header and data, between data and checksum, as well as between parameters, a “/” (2F(hex)) is used.

UCP packet structure

Header:

Checksum:

Data:

TRN : Transaction Reference NumberLEN : Length of the packetO/R : Operation or ResponseOT : Operation Type

The <data> fields depend on the Operation Type

The <checksum> is derived by the addition of all bytes of the header, data field separators and data fields

E.g.: stx03/00107/O/51/01727654321/12345/55555/1/01724444444//0100////////////3//4432204D657373616765/////////////99etx

List of UCP operations

Operation Type Initiated By Command Name

60 SMT Session management

61 SMT List management

51 SMT Submit SM

52 SMSC Deliver SM

53 SMSC Deliver notification

54 SMT Modify message

55 SMT Inquiry message

56 SMT Delete message

57 SMSC Response to Inquiry

58 SMSC Response to Delete

31 SMT Alert Operation

C lien t/ES M E

1

D ec o d e an d Valid a teUC P p ac k et

2

Han d le R es p o n s es

2

Han d le O p er a tio n s

M es s ag e S to r e

En q u ir y

R ep ly

3

En c o d e UC P p ac k et

UC P P ac k et

UC P P ac k et

R es p o n s e P ac k et

O p era tio nP ac k et

I n ter f ac e S tr u c tu r eS M S C

R es p o n s e S eq u en c e

4

Han d le A TM es s ag es

UC PS tru c tu r e

I n ter f ac eS tru c tu r e

R es p o n s eUC PS tru c tu r e

Data Flow Diagram

The Modules

UCP decoderUCP operation handlerUCP response handlerAT (Application Terminated) message handlerUCP encoder

The modules in the UCP server are

TestingUnit Testing

ModuleName

/ ID

Preparation/ Settings/Special Conditions For Carrying Out The Test

Test Condition/

Input Data

Results/ Output

checksum Using ^B (ASCII 02) as STX and ^E (ASCII 05) as ETX. Because ^C (real ETX) cannot be given as input.

^B18/00113/O/51/012345/09876//1/1920870340125000/4/0539//////3012961212//////3//4D657373616765203531/////////////CD^E

Valid Checksum.

checksum -do- ^B18/00113/O/51/012345/09876//1/1920870340125000/4/0539//////3012961212//////3//4D657373616765203531/////////////CE^E

Invalid Checksum.

Sample Test Records:

TestingSystem Testing

Module Name / ID

S.No

Preparation/ Settings/ Special Conditions For Carrying Out The Test Case

Test Condition/Input Data

Expected Results

UCP Server 1 SMSC is running. Client connected to specified IP address and port.

Send OP60 (bind) UCP packet with valid systemid (OAdC), password and subtype(1).

Client gets positive acknowledgement (ACK). The Client binds successfully.

UCP Server 2 -do- Send OP60 packet with invalid systemid (OAdC) or password.

Client gets negative acknowledgement (NACK) with error code “07” (AUTHENTICATION FAILURE)

Sample Test cases:

Conclusions

To allow applications to send and receive large number of short messages, an interface is needed to communicate with the SMSC.

The UCP server acts as the interface between application and the SMSC. The UCP server uses Universal Computer Protocol (UCP).

Applications like SMS gateway that follow UCP can communicate with the SMSC through the UCP server.

Future enhancements

List operation (OP61)Change password in OP60Legacy operations (OP 01, 02, 03, 30)Services limited by the SMSC

The following enhancements can be done in future