This is somewhat old-news now, but it’s worth noting. The Internet 2 is promoting an inititive called SIP.edu to make all telephones (and users) at a given institution reachable via SIP.
Stated goals are:
- Increase the number of SIP-reachable users within Internet2;
- Promote the convergence of voice and email identities;
- Build a community of Internet2 schools that is experimenting with offering enterprise SIP services.
The site shows a graph indicating the total number of SIP reachable users, which at this writing appears to be a little over 140,000.