title: Creating UDH for 7-bit concatenated SMS
body: <p>I need to send concatenated SMS for which i split the message(which is more than 160 bytes) in small parts now i want to put one header in each part.header have 6 octets as follows</p>
  
  <p>Field 1 (1 octet): Length of User Data Header, in this case 05.
  Field 2 (1 octet): Information Element Identifier, equal to 00 (Concatenated short messages, 8-bit reference number)
  Field 3 (1 octet): Length of the header, excluding the first two fields; equal to 03
  Field 4 (1 octet): 00-FF, CSMS reference number, must be same for all the SMS parts in the CSMS
  Field 5 (1 octet): 00-FF, total number of parts.
  Field 6 (1 octet): 00-FF, this part's number in the sequence. </p>
  
  <p>Example:
  05 00 03 CC 02 01 [ message ] 
  05 00 03 CC 02 02 [ message ]</p>
  
  <p>Now the problem is i want to put these 6 octets in 7 septets and which need to decrements the size of an SMS message from 160 to 153 characters.How to convert these 6 octets in 7 septets.is there any coding avilable</p>