V3 Prefix uniqueid with system name (global uniqueid)

Useful when more than one Motion server are logging CDR's to the same database table

Step-by-step guide

1. edit /etc/asterisk/asterisk.conf

2. uncomment line and change my_system_name with the unique system name (might be same or different from hostname) : 

   systemname = my_system_name

3. save and exit
4. edit /etc/asterisk/sip.conf

5. uncomment line and set the realm to asterisk : 

   realm = asterisk

6. save and exit

7. restart asterisk service 

   systemctl restart asterisk