Mobile carriers have taken the hint that they need to expand services to better appeal to enterprise customers, as a recent report from Infonetics Research concludes that 80% of carriers plan to offer fixed-mobile convergence plans to corporations by April 2008 at the risk of traffic falling off their network. (FMC involves merging office voice and data services with your handheld – a phone call on a single line can be answered from either office or cellphone.) That being said, enterprise VoIP will supposedly become more and more supported, and with Wi-Fi-enabled BlackBerrys pulling in to harbour, carriers don’t have much choice but to follow suit. Now, if the BlackBerry had session initiation protocol supported, RIM could have a solid foothold to get in on the ever-growing PBX phone integration business that carriers are moving towards. This isn’t to say the UMA handoff that the 8820 uses right now doesn’t have a place in new IP multimedia subsystems, but working with SIP sure would open up some possibilities.