Interworking between IMPTTP and PoC
IMPTTP can interwork with PoC network.
Currently PTT standard is only PoC(Push to talk Over Cellular) of OMA. Unfortunately because PoC has targeted to Cellular, it is based on IMS(IP Multimedia Subsystem).
Interworking with PoC
PoC has an interworking standard to interwork with another P2T network.
IMPTTP(IMPTT's Protocol) is a IP-PTT protocol.