Diagrams
36 still drawings, one per lesson, plus the home stack, the glossary map, and the integration map.
What the CPaaS section actually says
Still drawing
Twilio and Vonage, from the articles
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Bandwidth, Sinch, Telnyx, Infobip, and Bird
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What SIP is for
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Offer, answer, and SDP
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RTP, SRTP, and WebRTC
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E.164 numbers and direct inward dial
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Two domains and a SIP trunk
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How a guide tells you to get a number
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SMS, and the 160-character line
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MMS and the media a page will store
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10DLC is a name on the compliance pages
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A, B, and C on the STIR article
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SHAKEN, PASSporT, and the Identity header
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Where the vendors put the same words
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E911, the PSAP, and NG911
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Twilio's emergency calling page
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Bandwidth's two emergency hosts
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Voice and video names that opened
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Messaging and verify
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One Plivo number that really was on the page
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Webhooks come inbound
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TwiML verbs and what an IVR is
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A ladder you are allowed to draw
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Contact center words that stay general
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AI voice agents, only the sentences that opened
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Bridges the open pages actually name
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Numbers you may repeat
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What observability meant on the pages
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Prices that stay confirm
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Compliance starts by not pasting a secret
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Leaving a PBX without inventing a cutover
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Avaya, UCCE, and the pages that did not open
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FreeSWITCH and Asterisk
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Kamailio is a SIP server
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LiveKit, Jitsi, Matrix, and Jami
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Sources and go deeper
Opened 2026-10. A row marked confirm has no link, because that page was not verified.
- RFC. RFC 3261, SIP last checked 2026-10
- RFC. RFC 3550, RTP last checked 2026-10
- Wikipedia. Platform as a service, Communications platform as a service section last checked 2026-10
- Twilio. Twilio docs home last checked 2026-10
- Confirm. Release-specific steps for this page. confirm. last checked 2026-10