Depending on budget and if you have more than 240 users you could do a couple of things that come to mind immediately:
1. Unified Communications Manager Business Edition with the 2851 router that contains multiple VWIC-1MFT and/or VWIC-2MFT modules and a complimenting suite of DSP (PVDM) modules to handle both the data requirements and isdn voice requirements. This solution supports both the voice and voicemail requirements. You can add VT advantage to this system to allow peer to peer video conferencing but short of that, I think you need another system to handle that piece.
2. Multiple CCME routers dividing the users to keep the user limit under requirements. If you want voicemail, you will need to look into Unity Express and purchase that module as well. You will need to define how many concurrent VM connections you want to allow. As above, you can add VT advantage to this system to allow peer to peer video conferencing but short of that, I think you need another system to handle that piece.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
IOS XR configuration principles relevant for this article are:
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