Providing professional audio and video solutions to airport and public transportation agencies is a complex undertaking. Next generation passenger information systems require flexible, secure, and reliable solutions for delivering real-time announcements, service alerts, emergency messages, flight, gate and boarding information and more. This may include a network of airline terminals, transit stations and transit shelter stops. They can be supported by several servers, and an array of different voice announcement systems.

In order to overcome these challenges, TransitVUE® has developed a high-performance streaming audio-over-IP passenger information messaging system. Our solutions include Real-Time Transport Protocol (RTP) and Dante AV-over-IP solution. RTP and Dante enhanced public address systems have replace stand-alone analog systems as the new standard. They integrate directly with your passenger information system and can be easily managed through virtually any Layer 2, Layer 3, SONET or MPLS network over fiber optic and Ethernet cable..

Real-Time Transport Protocol (RTP)

Real-time Transport Protocol (RTP) is a network protocol for delivering audio and video over IP networks. It was developed by the Internet Engineering Task Force (IETF). RTP is one of the foundations of VoIP and it is used in conjunction with SIP, which assists in setting up the connections across the network. It’s used in conjunction with other protocols such as H.323 and RTSP. It is used in conjunction with the RTP Control Protocol (RTCP). While RTP carries the the media streams (e.g., audio and video), RTCP is used to monitor transmission statistics and quality of service (QoS) and aids synchronization of multiple streams. It is originated and received on even port numbers. The associated RTCP communication uses the next higher odd port number.

RTP Diagram


Dante replaces the need for long runs of specialized analog cables dedicated to only a single type of signal going to a single device at a time. It is AES67-2018 compliant and enables interoperability with other AES67 implementations by other compliant vendors. AES67 will provide an alternative open standard within Dante for transport using the RTP. It allows hundreds of channels of audio and video over fiber optic and Ethernet cables with perfect digital fidelity. All connections are managed, making routes fast, clear and reliable. Because all devices share the same network, signals can be sent between any devices no matter where they are located on the network. Dante devices are easily added to the network, like any other IP addressable device. Just connect additional devices to any available network jack and start using it. 

Improved Daily Communications

Effective daily communication is the key to an airport and public transit agencies success. TransitVUE® provides an audio solution that integrates all these technologies and more:

  • Pre-recorded audio announcements
  • Live voice messages
  • Ad-Hoc messages
  • Flight, train or bus arrival announcement
  • Ambient noise analysis

A digital audio over IP public address network guarantees you the ability to communicate with individuals or groups at the right time. This leads to quick responses and passenger satisfaction! Best of all, Dante or RTP can be networked directly with our multi-color LED variable information displays when not used with a public address system.

Ready to hear the quality and clarity of digital audio for yourself? Simply email us at or give us a call at (213) 222-8831 to schedule your free demonstration!

Integrated Passenger Information Solutions From Transitvue Communications Systems……  “When Quality, Experience and Technical Expertise Matters.”