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  Certain service providers request a special character in the dial string (e.g. '+'). To create a trunk that registers with the same special character:
 - Navigate to 'Trunks'
 - Edit the preferred Trunk
 - Click on 'Advanced Options'
 - Set 'Register Suffix'='+'
 - Click on the 'Save' button
 
  Now every number dialed will have a '+' added in front of it. For example, if the user dials '55510205', system will call '+55510205' when using this trunk.
  
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