Twilio great Collaboration SIP provider

After many hours of searching I found a great SIP provider for my personal Lab.  Twilio.com offer Elastic SIP Trunks that Instantly provision voice connectivity for IP-based communications infrastructure to connect to the PSTN, for making and receiving telephone calls to the ‘rest of the world’ via any broadband public or private connection.  I will be adding more on how to configure and your voice gateway and CUCM……