The following is the standard base cable that is recommened.

(This is what the Trimble 46290-00 (Base Cell phone adapter) will be if it is ever created)

It solves DTR (on most phones) and hanging up as soon as the modem when the modem answers.

Name	Pin	Receiver Side	Phone Side	Notes
CD	1	Not connected	8 on receiver
Rx	2	Straight though	Straight though	If using a normal download cable cross over with 3
Tx	3	Straight though	Straight though	If using a normal download cable cross over with 2
DTR	4	Not connected	Pin 6 on phone	If DTR doesn't need to be controlled, you don't have to loop 4 and 6
GND	5	Straight though	Straight though
DSR	6	Not Connected	Pin 4 on phone	Not Needed
RTS	7	Straight though	Straight though	Connect to pin 8 if not using a 37779 Rev B
CTS	8	1 on modem	Not connected	Connect to pin 7 if not using a 37779 Rev B
RI	9	Not connected	Not connected	Not Needed, Not recommend to be connected

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