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When dealing with timing constraints, the Z.120 standard of Message Sequence Charts (MSCs) is still evolving along with several proposals. This paper first reviews proposed extensions of MSCs to describe timing constraints. Secondly, the paper describes an analysis technique for timing consistency in iterating and branching MSC specifications. The analysis extends efficient current techniques for timing analysis of MSCs with no loops nor branchings. Finally, the paper extends our syntactic analysis of process divergence to MSCs with timing constraints.