Talk-A-Phone Co., Niles, Ill., a supplier of emergency communications and mass notification solutions, completed interoperability testing with the International Fiber Systems (IFS) transmission, fiber optic and Ethernet products from Interlogix. The IFS TT/TR3000 Series (-T variant) Touch-Tone Telephone Digital Interface from Interlogix now works with Talk-A-Phone’s analog ETP-400 Series Phones. The IFS range of network products is also interoperable with Talk-A-Phone’s VOIP-500 Series Phones. Interlogix is a part of UTC Climate, Controls & Security Systems, a unit of United Technologies Corp. (NYSE: UTX).