#Help!
I assume you are referring to call waiting interupting your connections to
CIS. If this is so, you can use this as your dial string:
For touch tone systems-
ATDT *70wXXX-XXXX where XXX-XXXX is the local access number.
Four pulse phone systems-
ATDP 1170wXXX-XXXX
I hope this helps…
-Jonathan