Unfortunately, we don't have enough information to give you an answer.
Here's some things to think about:
1. What type of calls are the 2k being spent on? Long Distance to customers? If so, VOIP won't make a difference. Long Distance to other offices? If so, VOIP could make a difference.
2. A lot of times, justification is made up from lower up front costs (not always) vs. a new PBX. Why are you looking to get rid of the existing system? Too old? End of Lease? Are you moving? If so, take a look at the VOIP solutions, if not, you may not be ready for VOIP.
3. How much do you spend on Moves, Adds, Changes? Basically, are you dumping a lot of money trying to have someone change the existing phone system around?
We would need more information if you want an idea of equipment. What type of business? How many sites? Network infrastructure?
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.