Specifies the range of local DTE subaddresses that identify the
 destination for the incoming call. Range consists of one or two
 subaddresses.  Subaddress is a decimal integer in the range 0
 to 9999. Separate two subaddresses with a single hyphen to indicate
 a range. The second subaddress must be greater than the first.  By
 default, no subaddress range is used.