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ike2-v4: request or response

After multiple reads of ike2-v4 I still cant figure out how to determine if a received message is
a request or response. Clearly, I must be missing something. For example, if the original ike-sa
initiator receives msg sequence N and is waiting for a response with sequence N, how does it
know that it is actually a response if on the off chance the next expected request from the
original responder is always sequence N?

Any enlightenment would be greatly appreciated.