SIP addresses enable Internet users to get in touch with other Internet users in real-time. SIP stands for Session Initiation Protocol and provides a framework for real-time text messaging, voice and video conferencing, even file sharing. SIP addresses are to Internet real-time communications what E-mail addresses are to Internet mail.
While SIP powers many VoIP infrastructures, few companies out there seem to care about surfacing SIP addresses to their end-users. The article i just wrote for "The Broadband Daily" attempts to raise awareness of those important issues.