Multimedia-enhanced emergency call systems

A gateway device, comprising:

• a memory device storing a set of computer-executable instructions;
• and
• one or more processors configured to execute the computer-executable instructions, wherein executing the computer-executable instructions causes the one or more processors to:
• receive, from a first user device, a request to establish a Web Real-Time Communications (“WebRTC”) call session;
• establish, based on the request, a first WebRTC call session with the first user device;
• establish, based on the request:
• a voice call session between the gateway device and an Internet Protocol Multimedia Subsystem (“IMS”) core, and
• a second WebRTC call session between the gateway device and a WebRTC portal server;
• and
• facilitate, via the established voice call session and the established first and second WebRTC call sessions, multimedia communication connectivity between the first user device and a set of devices that include:
• a public-switched telephone network (“PSTN”) terminal device, and
• a second user device.

A computer-readable medium, comprising:

• a plurality of computer-executable instructions stored thereon, which when executed by one or more processors of a gateway device, cause the one or more processors to:
• receive, from a first user device, a request to establish a Web Real-Time Communications (“WebRTC”) call session, the request being made by the first user device based on a voice call placed by the first user to a callee;
• establish, based on the request, a WebRTC call session with the user device;
• and
• facilitate multimedia communication connectivity between the first user device and a set of devices associated with the callee, the set of devices including:
• a public-switched telephone network (“PSTN”) terminal device, and
• a second user device,
• the facilitating including allows the PSTN terminal device and the second user device to each simultaneously receive at least a respective portion of multimedia communications output, via the WebRTC call session, by the first device.