PJSIP questions regarding multiple connections from same IP address

This changes how matching is done globally for all endpoints, but you can also change it per endpoint.
For PJSIP trunks there is now a GUI option:

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Setting this alone might actually solve the OP’s problem.

If not, identify_by=auth_username can be set for each endpoint in pjsip.endpoint_custom_post.conf.

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identify_by=auth_username