Hello, We are exploring kamailio source for use in our VOIP solution. This is the first time we are looking at open source. We have few doubts in using kamailio for providing our VOIP service. Under GPL any customization (customization mainly with respect to interacting with our proprietary applications e.g. Billing server) we do to kamailio also has to be provided to the end user. Our doubt is whether we can procure commercial rights to our customised code? Kindly clarify on this. Best Regards, Shankar