Profile: Rochelle Communications specializes in offering instruments for R&D, design verification and production test of telephony & VoIP products. The model 3500 caller ID/telephone production tester is a desktop instrument for full central office simulation of telephony and type 1 & 2 caller ID signals. It has a specific application for automated production testing of telephony devices with caller ID, call waiting and ADSI. Its software allows the user to set signal parameters such as level, frequency and duration for CAS, DTMF & single-frequency tones. The product includes a built-in loop simulator, adjustable line current and slow-speed modems for advanced telephony testing. The model 3540 is a two-channel DSP-based instrument that can be configured as a central office (FXS) on one or both channels and/or as telephony equipment (FXO) on one or both channels.