Service code

This option enables or disables a DISA or tie trunk caller ability to dial 9 for Trunk Group Routing or Automatic Route Selection (ARS/F-Route).

This option enables or disables a DISA or tie trunk caller ability to use Direct Trunk Access (Service Code  #9).

This option enables or disables a DISA or tie trunk caller ability to access trunk groups for outside calls (Service Code 704).