# Troubleshooting tree

Troubleshooting tree Separate signaling, media, identity, and emergency. The troubleshooting view is not Analyzer. Item What to remember Source Registers, no audio SRTP path and UDP ports. Not a SIP 200 problem. b2exve No registration NAT source-port preservation, SIP ALG, or DNS. b2exve 933 fails, calls work TCP 443 to both RedSky hosts. av6oo3, b2exve One department only Location PSTN connection and dial plan, not a global outage. T2-R03 Contact center idle Agent state, team, and queue skill. Not the Calling trunk. T3-R03 Back to the lab

## Sources and go deeper

Checked links were opened this month. A confirm row has no address because that page was not opened.

- Wikipedia: [Webex (Wikipedia)](https://en.wikipedia.org/wiki/Webex) — last checked 2026-10
- Vendor doc: [Webex Help Center](https://help.webex.com/) — last checked 2026-10
- DevDocs: [Webex developer documentation](https://developer.webex.com/) — last checked 2026-10
- DevDocs: [Webex developer getting started](https://developer.webex.com/docs/getting-started) — last checked 2026-10
- Community: [Webex community](https://help.webex.com/community) — last checked 2026-10
- SRND: [Cisco Collaboration design zone](https://www.cisco.com/c/en/us/solutions/enterprise/design-zone-collaboration/index.html) — last checked 2026-10
- RFC: [RFC 3261 SIP: Session Initiation Protocol](https://www.rfc-editor.org/rfc/rfc3261) — last checked 2026-10
- Port table: [IANA service name and port number registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) — last checked 2026-10
- Port table: [Port reference for Webex Calling](https://help.webex.com/article/b2exve) — last checked 2026-10
- Wikipedia: [Call centre (Wikipedia)](https://en.wikipedia.org/wiki/Call_centre) — last checked 2026-10
- Wikipedia: [Interactive voice response (Wikipedia)](https://en.wikipedia.org/wiki/Interactive_voice_response) — last checked 2026-10
- Release notes: [What's new for administrators in Webex Contact Center](https://help.webex.com/article/nv7abhz) — last checked 2026-10
- RFC: [RFC 3263 Locating SIP Servers](https://www.rfc-editor.org/rfc/rfc3263) — last checked 2026-10
- RFC: [RFC 3264 An Offer/Answer Model with SDP](https://www.rfc-editor.org/rfc/rfc3264) — last checked 2026-10
- Wikipedia: [Session Initiation Protocol (Wikipedia)](https://en.wikipedia.org/wiki/Session_Initiation_Protocol) — last checked 2026-10
- Vendor doc: [help.webex.com article frj1efb](https://help.webex.com/article/frj1efb) — last checked 2026-10
- Vendor doc: [help.webex.com article n0xb944](https://help.webex.com/article/n0xb944) — last checked 2026-10
- Vendor doc: [help.webex.com article 2zx7fg](https://help.webex.com/article/2zx7fg) — last checked 2026-10
- Vendor doc: [help.webex.com article jr1i3r](https://help.webex.com/article/jr1i3r) — last checked 2026-10
- Vendor doc: [help.webex.com article n4hssfr](https://help.webex.com/article/n4hssfr) — last checked 2026-10
- Vendor doc: [help.webex.com article 278bz2](https://help.webex.com/article/278bz2) — last checked 2026-10

---

Independent, free, learning-only student project. Not affiliated with or endorsed by any vendor. Trademarks belong to their owners. Concerns: https://cyphermonkeylabs.com/#contact

CypherMonkey Labs

© 2026 CypherMonkeyLabs

https://cyphermonkeylabs.com
https://github.com/CypherMonkeyLabs
https://linktr.ee/cyphermonkey