A method, computer readable medium having computer executable instructions, and a computer readable medium having stored thereon a data structure for signing and validating Session Initiation Protocol (“SIP”) routing headers are disclosed. A SIP node may receive a SIP request including a message...http://www.google.de/patents/US7535905?utm_source=gb-gplus-sharePatent US7535905 - Signing and validating session initiation protocol routing headers
