Ports and protocols

One page for the Calling firewall conversation. IP subnets change. Open the live article before you write an ACL. Retrieved 2026-10-15 from help.webex.com article b2exve.

ItemWhat to rememberSource
TCP 5062Certificate-based trunk signaling destinationb2exve
TCP 8934Registration-based trunk signaling destinationb2exve
5060–5280Phone SIP signaling source portsb2exve, 2026-09-07
UDP 8000–48199Local gateway media sourceb2exve
UDP 5004, 9000, 8500–8699, 19560–65535Media destinations toward Callingb2exve
TCP 443RedSky hosts and most HTTPS signalingb2exve
UDP/TCP 53 and UDP 123DNS and NTPb2exve

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