This Recommendation | International Standard specifies the Enhanced Communications Transport Protocol (ECTP), which is a transport protocol designed to support Internet multicast applications over multicast-capable IP networks.

This Recommendation | International Standard specifies the ECTP for the simplex multicast transport connection that consists of one sender and many receivers. This Recommendation | International Standard specifies the protocol procedures for the following protocol operations:

• connection creation with tree creation;
• multicast data transmission;
• tree-based reliability control with error detection, retransmission request and retransmission;
• late join and leave;
• tree membership maintenance; and
• connection termination.