[cisco-voip] Would you upgrade from 4.2.3 to 5.xx?

[Axel Wilzinski]

A little background:  We installed 4.2.3 about 8 months ago as part of a pilot program and have a several sites for a total of about 80-90 phones.  We will be adding our main site with approximately 400 users within the next 12 months.  We have one Call Manager Cluster that is sized for all of this along with a Unity server.Should we upgrade to the latest 5.X version and consider using SIP?  Is the upgrade a painful process and is there any long term benefit?  I am a little concerned about staying on the Windows platform and the proprietary SCCP protocol.  At the same time, I'm concerned about the reliability of 5.X and the learning curve.Any insight would be appreciated.Thanks!
_________________________________________________________________
Change is good. See what’s different about Windows Live Hotmail. 
http://www.windowslive-hotmail.com/learnmore/default.html?locale=en-us&ocid=RMT_TAGLM_HMWL_reten_changegood_0507
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://puck.nether.net/pipermail/cisco-voip/attachments/20070514/43f6598b/attachment.html