Method and apparatus for identifying a voice caller

A voice call system and a method and apparatus for identifying a voice caller are disclosed. The system includes a call originator apparatus and a called party apparatus . At least one trusted user identity is formed at the call originator apparatus , ideally in a trusted platform module configured according to a Trusted Computing Platform Alliance (TCPA) specification. The called party apparatus checks the trusted user identity when establishing a new voice call. Advantageously, an identity of the voice caller using the call originator apparatus is confirmed in a reliable and trustworthy manner, even when the voice call is transported over an inherently insecure medium, e.g. an open computing system like the internet . Preferred embodiments of the invention use IP telephony, such as SIP (session initiation protocol) or H.323 standard voice telephony.