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Multi-session PAT - why does multi-session PAT get this name?

Hello firewall experts

I have read configuration guide for ASA 9.1.1 and found the topic of per-session PAT and multi-session PAT.

The configuration explains well about the benefits of using per-session PAT but, it does not talk enough when we should use multi-session PAT and why.

Why did they give the name of multi-session PAT to this multi-session PAT?

What are the application protocols that would be benefitials to use multi-session PAT and why?  In the configuration guide, it speak to such protocols as SIP, H.323, and Skinny protocols as the candidates for multi-session PAT but, it does not mention why we should use it or what characteristics of these protocols make multi-session PAT more suitable for them.

Can someone help with it?

Thank you in advance.

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