??? UDH field misformed, rejected ???

If I calculate myself the oma binary hexadecimal content, can I
use /cgi-bin/sendsms to send those sms ?


trying it I receive the error message : "UDH field misformed, rejected"
with the UDH :
0B05040B8423F00003580201
0B05040B8423F00003580202


what's wrong with those udh ???




0B = 11 bytes after this one
05 : we are in hexadecimal format
04 : 4 chars / port
0B84 : source port
23F0 : destination port
00 : command 'multipart' because it is a multipart content
03 : length of 'multipart' data : 3 bytes after this one
58 : reference number to group of the messages (which I choosed)
02 : 2 sms to send the whole content
01 : this one is the first one