Start here
Ten minutes: read the home primer, open the CPaaS definition, then SIP and RTP, then one vendor page you actually use. Full course: the twelve tracks in order.
Full course
- What CPaaS names — The word, then the companies whose pages opened. First lesson: What the CPaaS section actually says.
- SIP, WebRTC, RTP — Signaling, the description, and the media. First lesson: What SIP is for.
- Numbers and trunks — E.164, DID, and the private and public domains. First lesson: E.164 numbers and direct inward dial.
- SMS, MMS, 10DLC — Text, media, and the registration names. First lesson: SMS, and the 160-character line.
- STIR and SHAKEN — Identity, attestation, and the vendor pages. First lesson: A, B, and C on the STIR article.
- Emergency calling — E911 words, and the duty pages that opened. First lesson: E911, the PSAP, and NG911.
- Programmable APIs — Voice, video, messaging, and verify. First lesson: Voice and video names that opened.
- Webhooks and IVR — Events inbound, and the verbs that gather. First lesson: Webhooks come inbound.
- Contact center and AI — IVR, ACD, and the agent pages. First lesson: Contact center words that stay general.
- Observability and price — Counts you can defend, and prices you confirm. First lesson: Numbers you may repeat.
- Compliance and migration — From a PBX toward a trunk, without a fake cutover. First lesson: Compliance starts by not pasting a secret.
- Open alternatives — FreeSWITCH through Jami, then dates you confirm. First lesson: FreeSWITCH and Asterisk.
Ten-minute path
Sources and go deeper
Opened 2026-10. A row marked confirm has no link, because that page was not verified.
- Wikipedia. Platform as a service, Communications platform as a service section last checked 2026-10
- RFC. RFC 3261, SIP last checked 2026-10
- RFC. RFC 3550, RTP last checked 2026-10
- Twilio. Introduction to Webhooks last checked 2026-10