Cloud native IoT platform provider SORACOM Inc. (Headquarters: Minato-ku, Tokyo; President and CEO: Ken Tamagawa) today announced the launch of "SORACOM Air RTC Gateway," a new feature for SORACOM Air. This service enables the integration and utilization of voice calls and text messages into IoT systems by connecting to customer-specified VoIP providers, PBXs (Private Branch Exchanges), and call centers, leveraging the voice call functionality (VoLTE) standard on cellular communication modules without requiring additional software stacks on the device side. In recent years, there has been a growing need to communicate "by voice" directly with operators from IoT devices in the field, such as parking payment machines and entry/exit gates in outdoor parking lots, emergency call buttons in elevators, remote medical care and calling in medical/nursing care settings, and support services from vehicles. Furthermore, with the advancement of generative AI, there is an increasing demand to implement initial responses and initial handling of emergencies using AI for voice-based primary reception. However, while voice call services provided by telecommunications carriers allow for calls to and from assigned phone numbers, they often struggle to support the flexible control required by IoT systems, such as restricting outgoing numbers or only receiving incoming calls from specific numbers. Utilizing dedicated VoIP services or PBXs allows for flexible system design, but this would prevent the use of the VoLTE function standard on cellular communication modules, necessitating the development of firmware or applications on the device side, creating barriers to introduction and operation. SORACOM Air RTC Gateway is a service that, when IoT devices using SORACOM IoT SIMs have VoLTE functionality, receives voice connections via that function on the SORACOM side and transmits them to the customer-specified connection destination. By setting connection destinations for each SIM group an