Some providers may give you a DID number such as '011+33+144856535' . But if users are used to dialing '0+144856535' this is what you need to do:

• Login to the system administration
• Set up a trunk to your provider
• Create a DID, for example
  '01133144856535'
• Navigate to 'Settings->Tenants->Edit->Other Networks'
• Set 'Mode' = 'Without access code'
• Click on 'Add Network'
• Set 'Prefix' = '0'
• Select the 'Strip Prefix' option
• Set 'Hidden Prefix' = '01133'
• Click on 'Save'

Now users will be able to dial '0144856535' and the system will call  '01133144856535'