SIP trunking has become a hot networking topic in the enterprise, but mobile operators have said very little. As noted in this No Jitter report, the SIP interface we would be looking for from the mobile operators would need to incorporate SIMPLE (SIP with IM and Presence Leveraging Extensions).
“That arm’s length connection to the enterprise is a major stumbling block to delivering the type of enhanced services enterprise users require. Direct connections to the mobile operators have been standard in Europe for a number of years, but there it has been primarily an issue of cost. Mobile calls delivered over those direct trunks are either free or highly discounted. While a better price is always attractive, the real incentive is to have a direct intelligent interface that will allow enterprises to truly integrate mobile users into the UC environment.
“The SIP interface we would be looking for from the mobile operators would need to incorporate SIMPLE (SIP with IM and Presence Leveraging Extensions). With SIMPLE we could not just make and receive calls, but have real-time presence and location information about the mobile device. That presence could incorporate power on/off as well as on/off hook; we could potentially receive battery status as well. Location could be based on the handset’s GPS location or even simpler cell tower location, which is less accurate but more battery friendly.”