Operating system name and version: RHEL5
Version of smsd: 3.1.14
Smsd installed from: package repository
Name and model of a modem / phone: MOBIGATER mini
Interface: USB

Using sendmail from the command line sms goes well.
But when you run the nagios files sendsms of messages are stored in /tmp and sms is not sent.
Why not post moves in /var/spool/sms/checked.