The gateway cut, without pretending to be the CUBE guide · Quiz

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.
• SIP trunk options chapter. vendor. last checked 2026-10.
• RFC 3261. 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 1035, domain names. rfc. last checked 2026-10.
• RFC 2782, DNS SRV. rfc. last checked 2026-10.
• ITU-T E.164, international public telecommunication numbering. standard. 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.
• confirm. NANP versus E.164, 20 ms ptime, and 'no internal extensions' are practitioner cautions. They are not quoted here as Five9 requirements. last checked 2026-10.