PTT (Push-to-Talk) over LTE is basically PoC (Push-to-Talk over Cellular) on 4G.
With the availability of broadband wireless networks using advanced 4G technologies, PTT has become more a business grade application with higher performance, superior quality of service and enhanced security, boosting business productivity as well as operations safety.
Zetel’s PTT over LTE is aligned with OMA’s PoC v2.1 standard. PoC v2.0 enables audio, video, text, and file sharing with a single recipient (one-to-one) or among multiple recipients, as in a group session (one-to-many).
See Zetel PTT-over-LTE Whitepaper for more details.