Techniques for communication based on sharing talker ID across communications networks are disclosed. Push-to-talk (PTT) over broadband services are provided over a first communications system. The first communications system includes a plurality of user devices. A Talker ID is associated with a first user device from the plurality of user devices on the first communications system. The Talker ID uniquely identifies the first user device. A communication is sent from the first user device to a second user device on a second communications system. An information message is provided, from the first user device to the second user device, wherein the information message includes the Talker ID of the first user device. The communication and the information message are received on the second user device. The communication and the information message are displayed on the second user device.