# Digit strings in outbound calls

Calling address (ANI) and DNIS information is passed in two separate digit strings in nccPlaceCall invocations:

- The called party information is passed in the calledaddr argument. The ISDN Software TCP expects this digit string to be formatted as:
  d 1...d n * t 1...t n
  ...where:
  d 1...d n are the digits to dial.
  t 1...t n are the subaddress digits to dial, if needed. If no subaddress is used, omit the * and t digits from the string.

- The calling party information is passed in the callingaddr argument. The ISDN Software TCP expects this digit string to be formatted as:
  a 1...a n * s 1...s n
  ...where:
  a 1...a n are the address of the calling party.
  s 1...s n are the subaddress digits of the calling party, if used. If no subaddress is used, omit the * and s digits from the string.