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unified communications as a service

RingCentral, Zoom Phone, Microsoft Teams Phone

SystemTechniques · 23Primitives · 85 ucaas Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Presence trackingdistributed · medium: Heartbeats refresh per-connection TTLs; a user is online while any connection lives, with a grace period that hides reconnect flaps.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Pub/sub fan-outdistributed · medium: Deliver one published message to every subscriber of a topic by sharing one encoded payload and giving each connection a bounded queue with an explicit slow-consumer policy.›Acoustic echo cancellationmedia · medium: Adaptive filter (NLMS/frequency-domain) removing far-end echo from the microphone signalJitter buffermedia · medium: A receiver-side buffer holds packets just long enough, a delay tracked from recent arrivals, to reorder them and hand out media at a steady rate.›NAT traversal (STUN, ICE, TURN)media · medium: Learn your public address with STUN, swap candidate addresses over signalling, test pairs with ICE checks, and fall back to a TURN relay if no direct path works.›RTP and RTCPmedia · low: RTP stamps each media packet with sequence number, media-clock timestamp and source ID; RTCP reports loss, jitter, round trip and clock mapping within a bandwidth cap.›Sdp offer answermedia · low: SDP session descriptions and offer/answer negotiationVoice activity detectionmachine-learning · low: Per-frame speech/non-speech decision with smoothing, from an energy threshold over a tracked noise floor up to small neural nets.›SRTPmedia · low: Per-packet encryption, authentication and replay protection for RTP and RTCP that keeps the headers readable, with the packet index derived from the 16-bit sequence number.›E164 number parsingdata-structures · low: Parse, validate and normalize phone numbers to E.164Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesProcess supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Audio mixingmedia · low: Summing many streams with gain, clipping control and per-listener minus-one mixesMu law a law compandingmedia · low: G.711 logarithmic companding of 8 kHz speech samplesSip signalingmedia · low: SIP call setup, dialogs, SDP offer/answer and registrar/proxy routingLongest prefix matchnetworking · low: IP prefix lookup structures (DIR-24-8, Poptrie, LC-trie) for routes, ACLs and geo-IPWebSocketsnetworking · low: Full-duplex message framing over one upgraded HTTP connection; the standard way to push real-time data to browsers.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Forward error correctionsignal-processing · low: Add redundancy (LDPC, Reed-Solomon, XOR parity) so receivers repair loss without retransmitGraceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Hierarchical state machinesystems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.›+ 16 more techniques+ 69 more primitives

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