This is the sender number, which must be in international address format, starting with the country code. The sender number cannot contain any leading "+" or "00."
The sender number must be verified. Otherwise, the submit_sm request will be rejected.
The destination address must be in international format, starting with the country code, and it shall not contain any leading "+" or "00."
GSM Protocol ID (See GSM 03.40  22.214.171.124) (D.G. - Can we link to standard?)
GSM Data-Coding-Scheme ( See GSM 03.40  126.96.36.199)
Length of the message text in bytes.
Up to 140 octets of data. This is the text that is transmitted to the mobile station.