Operating system name and version: Linux Mint KDE 64Bits
Version of smsd: 3.1.14
Smsd installed from: sources
Name and model of a modem / phone: ATI - ZTE CORPORATION

Hello, i have the next problem: i can receive messages from the modem but i cant send.
I've been reading about a smsc number that may be missing, but i dont know how to find that number if thats the case. My conf is this:

And the log is: