Do you know your SIP basics? If the answer is, "well...sort of," or, "maybe...not so much," don't feel bad. Just sit back with your favorite beverage in one of your kid's sippy cups and read this excellent articles that seeks to sort out everything you wanted to know about SIP but were afraid to ask. The topics covered include SIP vulnerabilities, SIP testing, and SIP-based phones. Article [1]
Links:
[1] http://www.computerweekly.com/Articles/2007/07/02/225261/voip-sip-fundamentals.htm