"Stream Control Transmission Protocol" complements TCP and UDP. Useful reading includes "SCTP for Beginners" [1], the Wikipedia page [2], RFC 2960 [3], a Networksorcery explanation [4] and http://www.sctp.de/ .

Here are two important facts about SCTP:

• it's designed to transport PSTN (conventional telephony) over IP; and
• the third (that is, the posthumous) edition of Stevens' book [give reference] covers it.

The big question for Tclers is whether Tcl deserves an SCTP-savvy extension. Is ceptcl a good location?

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