I have delevoped an application which uses the comm serial port and "AT" commands to send and SMS message via and SMSC using the TAP protocol. I want to now add ringtone sending to my program. I understand that and RTTL message must be "encoded" and a "header" placed on the font of the message, i have read the Smart Messaging Specification but i am very confused. Should i just try harder to understand the nokia documentation? or can anyone explain how the encoding and header creation works, or possibly give a general "algorithm" of the process of encoding and adding the header

many thanks in advance