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Transport Protocols Certain nodes MUST support at least SCTP or TCP (i.e. Diameter Client) Others MUST support SCTP and TCP (i.e. Diameter Servers and Agents) Security TLS and IPSec Selection Process (in order of execution) IPSec, SCTP, TCP, TLS SCTP or TCP is always attempted prior to capabilities exchange TLS tried after capability negotiation IPSec and TLS maybe used exclusively |