Follow the below steps for restarting kannel:-

 1. Stop all the kannel processes by the command, sudo /etc/init.d/kannel_sqlbox stop

      Output for the command:-

            [sudo] password for alerts:
           Shutting down smsbox... done
           Shutting down bearerbox... done

2. Stop all smsbox and bearerbox activities by,
        sudo killall -9 smsbox
        sudo killall -9 bearerbox

3. Clear and remove the spool location where message queue is stored, and then create a new fresh directory

      rm -rf /home/alerts/kannel_queue/spool/*
      rm -rf /home/alerts/kannel_queue/spool
      mkdir /home/alerts/kannel_queue/spool

4. Start the kannel process again.

      sudo /etc/init.d/kannel_sqlbox start

      Output for the command:-

       Starting bearerbox... done
       Starting smsbox... done


  If you get an alert something like the following,

2011-06-30 04:29:15 [31721] [0] PANIC: Could not open pid-file `/var/run/smsbox.pid'
2011-06-30 04:29:15 [31721] [0] PANIC: System error 17: File exists
2011-06-30 04:29:15 [31721] [0] PANIC: /usr/local/sbin/smsbox(gw_panic+0x16d) [0x43be3d]
2011-06-30 04:29:15 [31721] [0] PANIC: /usr/local/sbin/smsbox(get_and_set_debugs+0xa80) [0x447dc0]
2011-06-30 04:29:15 [31721] [0] PANIC: /usr/local/sbin/smsbox(main+0x33) [0x40db73]
2011-06-30 04:29:15 [31721] [0] PANIC: /lib/libc.so.6(__libc_start_main+0xf4) [0x2ab70567c1c4]
2011-06-30 04:29:15 [31721] [0] PANIC: /usr/local/sbin/smsbox [0x40d4a9]


then repeat the steps from 1 to 4 untill the required output has obtained.