Embodiments of the systems and methods described herein relate to covertly monitoring call audio and obtaining other communications of a source device with a target device. For example, a source, with a mobile phone configured as the source device, and working in cooperation with an agency agrees to the interception communications at the source device. A covert application provided to the source device manages configuration of the source device and covert interception of the communications. The intercepting of communications at the source device is performed covertly to protect the source in instances where the source is an undercover informant with the agency.