As noted above, this project began with contributions from Pingtel. Pingtel began life focused on the development of VoIP phones, and quickly narrowed that focus to SIP phones. The Pingtel Expressa phone was considered one of the best SIP phones in the business at one time, and nearly every SIP interoperability lab had at least one for testing (some probably still do). It was, alas, not a commercial success, and Pingtel eventually shifted its focus to the SIPxchange PBX product and the accompanying open source projects as described above. | 