A system is provided for promoting push-to-talk communication. An exchange component identifies a voice call between a first mobile device and a second mobile device. The exchange component determines whether the first mobile device selects to share a first push-to-talk contact identifier associated with the first mobile device with other mobile devices. If the first mobile device selects to share the first push-to-talk contact identifier, the component determines whether the second mobile device selects to share a second push-to-talk contact identifier associated with the second mobile device with other mobile devices. If the second mobile device selects to share the second push-to-talk contact identifier, the component communicates the second push-to-talk contact identifier to the first mobile device and the first push-to-talk contact identifier to the second mobile device.