Headsets, and the call that only fails one way · Sources and go deeper

Sources and go deeper

• Technical requirements PDF. vendor. last checked 2026-10. Fetched for this lab in October 2026. Re-read before you buy hardware or open a firewall.
• RFC 3261, SIP: Session Initiation Protocol. rfc. last checked 2026-10.
• RFC 3550, RTP. rfc. last checked 2026-10.
• RFC 3551, RTP profile for audio and video. rfc. last checked 2026-10.
• ITU-T G.711. standard. last checked 2026-10.
• RFC 8446, TLS 1.3. rfc. last checked 2026-10.
• RFC 1918, private internet addresses. rfc. last checked 2026-10.
• RFC 4787, NAT behavior for UDP. rfc. last checked 2026-10.