Xnet Communications has produced iSoftPhone 1.0, voice over internet protocol (VoIP) calling software for Mac OS X.

The software is invoked through an on-screen iPhone-inspired user interface.

The company promises crystal-clear voice clarity in calls. iSoftPhone integrates with a user's existing Address Book, sends SMS messges to mobile phones and can also be employed to create private telephone networks using SIP (Session Initiation Protocol).

It's a flexible solution; users can employ different VoIP callling services using iSoftPhone.