Is it possible that a specific MME has two MME Codes in LTE?

Question

Is it possible that MCC MNC gets changed in the same Diameter session without changing session ID while in Roaming???
As I have come to across an unsupported scenario when some users are roaming in Iceland operator MCC MNC and suddenly switch to different operator MCC MNC which belongs to the USA within the same DCCA session i.e without closing the PDP context and opening a new one (that should not be possible, unsupported scenario). Is it possible??? I'm confused here.

Answer 1

As far as I know, MME code should be unique for each MME belongs to a particular MME group.
Answer "One MME can have only one MME code" but may serve multiple PLMNs.