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 Some providers or  services need a trunk prefix to be sent before the actual destination  number. For example: 8 12124007921 or 8 02071276280. To set a prefix for  Zaptel or Voip trunks:   - Login to the system administration
 - Navigate to 'Trunks'
  - Click on the 'Edit' button next to your preferred trunk
 - Click on 'Advanced Options'
 - Set 'Prefix'='$PREFIX_NUMBER' (e.g. $PREFIX_NUMBER = 55)
 - Click on the 'Save' button
         Please note: when the trunk prefix is set as in the above examples, ALL calls through this trunk will be prefixed. 
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