Does Cisco have GSM Gateway product work with router call management systems to route GSM calls?

We have a Csico2851 with telephony supports for the head office. However, I work away from the head office all the time as a single developer here. How do I set up a home office that can both VPN to head office servers and also have a VOIP to the hea...

I have couple questions: 1. Is IOS Server Load Balancing a basic functionality for both IOS 12.2 and 12.4?2. If I want to run a server load balancing function on a switch, what is the entry switch model of switch series that I can start with?