The good folk at Siemens are claiming that their new CX70 phone is the world’s first push to talk handset which uses the open IMS standard. And who are we to argue?

‘With the introduction of the CX 70, Siemens mobile is the world’s first manufacturer to offer an end-to-end solution for “Push and Talk” (PaT) based on open specifications…As the first Voice-over-IP application, Push and Talk is based on the IP Multimedia Subsystem (IMS), the technology platform for many future multimedia services.’