Please find that useful article by visiting the link mentioned below.

http://www.microsoft.com/dynamics/crm/using/deploy/iframesharepoint.mspx

I will not dwell much in the structure of UDH for long/concatenated SMS. Here is summary of fields:

Field1: (one byte) This is length of UDH. (UDH len is not field, but let us keep it simple for now)

Field2: (one byte) This is IE (Information Element Identifier). This decides whether CSMS ref number (Field 4) will be 1 byte or 2 bytes. In our case this will be 00 which makes it 1 byte. 08 is used for 2 bytes

Field3: Information Element data length. Keep in mind, Field1 and Field2 will be excluded from this. In our case, it will be 3

Field4: CSMS Reference number, any byte value

Field5: Total number of segments of SMS. (Each segment being of 153 chars max)

Field6: Sequence number of SMS part.

Sending multi-part/concatenated/long SMS using UDH can be summed up in the following steps:

· Set User Data Header Indicator(UDHI) which is done by setting 0×40 in ESM Class of the SMS

· Do not set SMS text in the SMS request object for message will be appended in UDH

· Split Long SMS in chunks of max characters 153 in each

· Set UDH field values as given above

· Append SMS text in UDH

LOS comes with a class org.smpp.test.SMPPTest. I have added a method in this class with the signature submitLong(). Complete method is in the attached file.

Concatenated/Long SMS part of the method is:

SubmitSM smRequest = new SubmitSM();

SubmitSMResp response;

— — — Set other request values

smRequest.setEsmClass((byte)Data.SM_UDH_GSM); //Set UDHI Flag Data.SM_UDH_GSM=0×40

String[] splittedMsg = this.sptlitString(shortMessage, 153);

int totalSegments = splittedMsg.length;

//iteerating on splittedMsg array. Only Sequence Number and short message text will change each time

for (int i = 0; i < totalSegments; i++) {

ByteBuffer ed = new ByteBuffer();

ed.appendByte((byte) 5); // UDH Length

ed.appendByte((byte) 0×00); // IE Identifier

ed.appendByte((byte) 3); // IE Data Length

ed.appendByte((byte) randInt) ; //Reference Number

ed.appendByte((byte) totalSegments) ; //Number of pieces

ed.appendByte((byte) (i+1)) ; //Sequence number

//This encoding comes in Logica Open SMPP. Refer to its docs for more detail

ed.appendString(splittedMsg[i], Data.ENC_GSM7BIT);

smRequest.setShortMessageData(ed);

System.out.print(“#” + i + ” “);

System.out.println(“Submit request ” + smRequest.debugString());

response = session.submit(smRequest);

messageId = response.getMessageId();

}

}

That’s all!

Hope this will help you. I tried this with 2 other APIs and it worked fine but sometimes I got 0×58 (throttle error)

The way is same for all the API, you may just have to give a few moments to find out how API allows to set UDHI and takes UDH data.