[cisco-nas] CPU usage : PRI vs CAS

[Aaron Leonard]

> Aaron,

> once again, you save the day!  Thanks.

> One more question, if I may...

> Would you remind me why I would use ISDN instead of CAS if I only get
> dial-up/modem calls ?  We used to use CAS and then switched to PIRs. I remember
> that it's difficult to match user vs line with CAS, but it's not a whole lot
> easier with PRIs. Plus, I lose one line for ISDN signaling.

> So, why would I stick with ISDN ?

ISDN pros:

- slightly faster speeds (typically 1.3-2kbps) than CAS
- faster call setup times - save 1 - 4 seconds per call vs. CAS
- more functional signaling - get full ANI and DNIS.  Typically
  you will not get ANI/CLID with CAS, which makes troubleshooting
  harder.

Aaron