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contact-center

cloud contact center with call routing and IVR

Twilio Flex, Genesys

SystemTechniques · 28Primitives · 97 contact-center 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.›RNN transducer (RNN-T)machine-learning · medium: Streaming sequence model that sums all monotone alignments in a frame-by-label lattice and conditions each label on earlier ones.›Speaker diarizationmachine-learning · medium: Segment audio by speaker via embeddings and clusteringJitter 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.›Packet loss concealmentmedia · medium: Synthesize missing audio frames from prior signal (pitch repetition, neural PLC)Voice 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.›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 negotiationSRTPmedia · 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.164Object storagecloud · low: S3-compatible blob storage at cents per GB-month with 11 nines durability; pick by egress price, request price and latency, not by storage price alone.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesStatechartsgraphics · low: State machines with nesting, parallel regions, history and entry/exit actions, so UI and animation logic stays linear in size instead of exploding.›Process 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 samplesOpus codecmedia · low: Opus audio codec: SILK/CELT modes, frame sizes, bitrate and FEC settings for real-time voiceSip signalingmedia · low: SIP call setup, dialogs, SDP offer/answer and registrar/proxy routingWebSocketsnetworking · 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.›Graceful 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.›+ 21 more techniques+ 81 more primitives

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