Operating system name and version: CentOS 6.4
Version of smsd: 3.1.15
Smsd installed from: package repository
Name and model of a modem / phone: ...
Interface: USB

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Im new in linux. I use CentOS. I installed smsd with 5 modems. Each one works separately, but when i enable the line
checkhandler = /usr/local/bin/load_balancing.sh
in smsd.conf i cant send more sms.
Any idea?
(sorry for my english)

stats = /var/spool/sms/stats
checkhandler = /usr/local/bin/load_balancing.sh

devices = GSM1,GSM2,GSM3,GSM4,GSM5
logfile = /var/log/smsd.log
loglevel = 6

[queues]
Q1 = /var/spool/sms/Q1
Q2 = /var/spool/sms/Q2
Q3 = /var/spool/sms/Q3
Q4 = /var/spool/sms/Q4
Q5 = /var/spool/sms/Q5

[GSM1]
device = /dev/gsmmodem1
incoming = yes
keep_open = yes
keep_messages = yes
queues = Q1
baudrate = 115200
rtscts = no

[GSM2]
device = /dev/gsmmodem2
incoming = yes
keep_open = yes
keep_messages = yes
queues = Q2
baudrate = 115200
rtscts = no

[GSM3]
device = /dev/gsmmodem3
incoming = yes
keep_open = yes
keep_messages = yes
queues = Q3
baudrate = 115200
rtscts = no

[GSM4]
device = /dev/gsmmodem4
incoming = yes
keep_open = yes
keep_messages = yes
queues = Q4
baudrate = 115200
rtscts = no

[GSM5]
device = /dev/gsmmodem5
incoming = yes
keep_open = yes
keep_messages = yes
queues = Q5
baudrate = 115200
rtscts = no