Description: Select digits to be added in front of or at the end of the received stream (after the stripped digits are removed) before sending the digit stream to the remote port. Range: 1 to 20 characters (valid characters are 0 through 9, '*', '#', 'R', 'P', and '-'). The character '-' is allowed only for ease of reading. It is not sent to the remote port. The 'P' character is used to indicate a pause is required in the playout of the digits at the remote end. The length of the pause is equal to 'Tx Interdigit Pause Time' as defined at the called port (destination port). Leading 'P' characters are not supported. The character 'R' is used to separate the prefix digit string from the postfix digit string Note: The maximum number of digits that can be sent to the remote end is 16.