VoIP is the way to go, if your company has not yet started evaluating this technology then it is definitely the time to start. Contact your existing telephony system vendor and see what migration paths they have to move your systems over to VoIP.
Look into and test their security, check out the protocols they work with and see if you can live with standard protocols or need the features offered by proprietary modified protocols.
Before the new system is deployed, perform a comprehensive mean opinion score (MOS) test on your existing telephony system, then, when the new system is trialled or in pilot phase, repeat the MOS testing with the same testers to ensure that the VoIP system is as good if not better than the original system.
It may be worthwhile spending a little extra and contracting this testing to a third party to ensure no bias is added due to internal employees feelings towards the original or newer system.
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ISP's are currently battling the broadband war. The race for customer aquisition is aggressive. What is the holy grail... VoIP or basic broadband revenue? The answer lies in the current broadband price offerings of ISP's.
The cost savings of VoIP to corporations is unquestionable and the future economic benefits of widespread adoption is inevitable. One just needs to review the developments of such products as 'Skype' over the last 12 months to arrive at the realisation of just where VoIP is heading. Companies in Asia have even commenced manufacturing 'Cisco ATA type' devices which interface with skype enabling VoIP calls from your normal PSTN phone. The future of VoIP is cemented and the war for market share is definitely on.