Macintosh CCLs (.sit file) These CCLs can be used with Apple's TCP/IP and OT PPP (Open Transport PPP) dialer as well as Apple Remote Access 2.x and above. Supported by Hayes ACCURA models from V.32bis (14.4K) up to 56K (K56flex/V.90/V.92) Lucent- or Rockwell-based modems.