Like other Networks we use MCC ( Mobile country code ) to allocate Talk Groups.
talk group Naming and allocation
This is done by the Servers in each country.
If more than one server is in your country, you work together.
In the UK we have some rules for ones to follow.
Via OPB ( OpenBridge )
Local to your server – 1 to 89 ( non local – TG 9 Slot 2 Enhanced Talk Groups “Dial-a-TG” )
World Wide – 90 to 973 at this time
Countries – MCC ( UK 235 to 23599 ) ( * You still have 6 and 7 Dig Talk Groups)
World Wide Talk Group
This is a list of all Named Talk Groups in use.
Users can also use non named Talk Groups via OPB.
Local & Optional Local talk groups
Local 1 to 89 800 to 899 9990 to 9999
Optional lets say 90 to 973 that is not in use via World Wide.
You can make them local this way.
As only local to your server, they do not get named on the World Wide Talk Group list.
Getting your Talk Groups Listed