James wrote:

Thank you,Russ.But I think,regardless of the dialing rules,the way
must be pre-defined to enter the extension number in the phone number
box on the Outlook contact form, e.g. a letter "w" for an outside
line,a comma "," for a pause,and what for the extension number?

You can define an extension any way you please in the phone number field of
the COntact form. The problem is that the Windows dialer has no provision
for controlling a voice modem, so adding modem commands to the phone number
is pointless. The Windows dialer expects another modem to answer.
--
Brian Tillman