Have a look at SecureLogix - TeleWall, it might be a better option for you. It connects between your PABX and your Telecom's provider - monitors modem dial out and in and blocks if nessary.
www.securelogix.com/telewall/ Regards Steven ---------------------------------------------------------------- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.