We are testing Asterik, for a VOIP solution, as a replacment for an aging PBX in one of our branch offices. We have forecasted 23K needed to replace the PBX and phone sets. This is going to require a complete change out of phone systems. We are running a 1.5 MB MPLS to all of our branch offices. We are using open source for enterprise solutions such as security, helpdesk, and a means of securing of our incoming customer data transmissions. While I don't mind using open source for some solutions I have concerns about using it in this instance.
I would like to know your experiences with Asterik and any lessions learned you can pass on.
Though more costly, we are also considering the Cisco VOIP solution. We have 2821 routers in all of our branch offices and went with these routers with the thought that we might migrate to the CISCO VOIP solution.
Any input you can provide would be greatly appreciated.