We have a large number of customers that are building Internet Telephony Service Provider (ITSP) businesses. We find that majority of these customers have bootstrapped their business using FreePBX and Elastix distributions. Likewise, some of our corporate customers have migrated to FreePBX from a proprietary PBX, but now they are trying to scale their deployment because they have added additional offices or acquired another company. In both cases, ITSP’s and corporate customers can use Kamailio as a proxy server/Session Border Controller that resides in front of their existing FreePBX and Elastix distributions to provide one or more of the following services:
- load balancing
- fault tolerance
- implement a central voicemail server
- protect against flood SIP attacks from sipvious
- redirecting SIP traffic to local server
- rewriting the SIP headers
- handling SIP registration transparency