The problem is that RFC 3261 that defines SIP has become "everything to everyone" and bloated in both size and in flexibility. For those of you that have deployed SIP-based solutions or SIP Trunking, ...
5 Biggest Myths About SIPs: Systematic Investment Plans (SIPs) in mutual funds have become the easiest and most popular way for millions of people to make money these days. By investing a small amount ...