I would like to understand how pinholing works on Cisco Firewalls.
We use SIP as a protocol to make video calls. i have read about problems which sip has traversing NAT.
protocols like h460 17/18/19 are used to fix this issue.
As per my understanding > any thing from private to public is allowed.
so suppose a user A Video endpoint dials user B Video End point on public internet.
how will a pinhole for signaling and media will be created.
Also what happnes if user B shares presentation and traffic comes from public to private network.
how does a firewall takes care of that.
Please help me understand on layman terms.
Thank you in advance.