Why not buy an inexpensive home telephone exchange? (say one-line 4 extension) - you might be able to pick one up second hand even. Jim ----- Original Message ----- From: "Tim McDonough" To: Sent: Tuesday, August 27, 2002 8:43 PM Subject: [EE]:Telephone System Simulation I'm working on a project where a device with an internal modem needs to be tested in an environment where it will share a telephone line with other devices like telephones, fax machines, credit card machines, etc. Anyone have first hand experience with testers/simulators that can be programmed to produce phone line conditions such as other devices being off hook, etc.? Tim -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.