It will go all towards the totally integrated systems that run it all through the network from voice,Fax and legacy devices like modems to the integrated Messaging (different names for different companies) which is a feature rich voicemail to e-mail application. SIP is really right now the big coming thing due to presence and the system knows if you are available or not, if you are looking for something new then ask yourself if you need all the new features and if you can afford them because the phones that use the network need to have a bullet proof network and setup and ANY change on your network can affect your phones which means you have to check before you implement any new switches routers and so on into your network because losing you PC's for two hours is bad but losing phones AND PC's for the same amount of time is the reason people get fired for.
Joe W.
FHandw., ACA, ACS
If you can't be good, be good at it!