Asterisk message queue

Does asterisk have a message queue (for PJSIP or other)? For example, if asterisk has a lot of OPTION messages awaiting response, could the message queue fill up and prevent other messages from being processed?
Otherwise, is there any other reason why the asterisk’s communication might stall until restart of the asterisk service?
Asterisk version: 16.30

For anyone to investigate a deadlock, you would need to update to a supported version, making sure that it was debuggable, then obtain a deadlock backtrace.

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