About
Our Story — 16 Years of Telecom DNA
2008: SMSDAM — The Bulk SMS Pioneer
Joomo Enterprises entered the telecommunications arena with SMSDAM, a carrier-grade bulk messaging platform engineered from the ground up on the SMPP v3.4 protocol. At a time when enterprise messaging was dominated by expensive closed-vendor stacks, SMSDAM offered operators and enterprises a robust, open-protocol alternative capable of handling millions of messages daily across MT (Mobile-Terminated) and MO (Mobile-Originated) message flows.
The platform integrated directly with operator SMSCs (Short Message Service Centres) over dedicated SMPP sessions with full bind_transmitter / bind_receiver / bind_transceiver negotiation. Delivery confirmation relied on end-to-end DLR (Delivery Receipt) tracking, and routing intelligence was built on live HLR (Home Location Register) queries over SS7/MAP signalling — enabling number portability lookups, MSISDN range validation, and traffic routing across interconnected operators without revenue leakage. The billing engine natively consumed operator CDR feeds and supported pre-paid credit controls.
2010–2013: Convergent Billing & IN Platform
Growing operator demand pushed Joomo into convergent billing with an Intelligent Network (IN) mediation layer compliant with CAMEL Phase 2 & 3 (CAP), connecting to operator SCP (Service Control Points) via INAP/CAP over SS7 to intercept prepaid call events, apply real-time charging, and enforce credit limits without breaking the bearer path.
The CDR pipeline was redesigned for carrier-scale throughput: raw ASN.1-encoded CDRs from MSCs and SMSCs were ingested, decoded, correlated across originating and terminating legs, and normalized for downstream billing systems. Integration with RADIUS for broadband session accounting and Diameter (RFC 6733) for EPC/LTE Online Charging gave the platform coverage across both legacy 2G/3G and emerging 4G/LTE domains. Inter-operator settlement used the TAP3 roaming data exchange format mandated by the GSMA, enabling automated reconciliation of roaming charges between partner networks.
2014–2017: VoIP Infrastructure & Carrier Interconnect
The shift from circuit-switched PSTN to packet-switched VoIP represented the defining technology transition of this era, and Joomo was involved from day one. The company built a carrier-grade VoIP core handling call signalling via SIP (RFC 3261) with full SDP offer/answer negotiation for codec selection — supporting G.711 (PCMU/PCMA), G.729, G.722 wideband, and Opus for high-definition voice.
Media transport ran over RTP (RFC 3550) with SRTP (RFC 3711) for encrypted media streams, using DTLS-SRTP (RFC 5763) for key exchange. NAT traversal was solved through a full STUN/TURN/ICE stack, and call quality was monitored using RTCP metrics — jitter, packet loss, and MOS (Mean Opinion Score) scoring. Carrier interconnects were provisioned over SIP trunks with Tier-1 operators, with call routing governed by LCR (Least Cost Routing) logic that factored in per-destination termination rates, codec compatibility, and real-time quality scores.
2018–2021: AI Research & ASR Pipeline Development
With a decade of call data and deep VoIP experience, the next logical step was intelligence. Joomo's R&D arm invested in Automatic Speech Recognition (ASR) research, benchmarking acoustic models from Kaldi and wav2vec 2.0 through to OpenAI's Whisper and Google's Conformer architecture — selecting the optimal combination for telephony-quality audio ranging from 8 kHz narrowband to 48 kHz wideband.
The NLP layer explored summarization and information extraction using BART (Bidirectional and Auto-Regressive Transformers), T5 (Text-to-Text Transfer Transformer), and classification with BERT/RoBERTa fine-tuned on business conversation datasets. Speaker diarisation — separating who said what — was tackled with GMM-HMM speaker models and later upgraded to neural speaker embeddings. Operationally, Docker and Kubernetes were adopted for containerized microservice deployment, enabling the AI inference pipeline to scale independently of core VoIP signalling.
2022–2024: Crypto-Native Payments & Global Settlement
Traditional telecom billing had always been constrained by correspondent banking relationships, inter-operator settlement delays, and high FX costs. Joomo set out to dismantle those barriers entirely. After deep research into Layer-2 Bitcoin infrastructure, the Lightning Network was adopted as the primary payment rail — enabling sub-second, micropayment-capable, trust-minimized settlement for per-minute call billing with transaction fees measured in satoshis.
For network-layer settlement between platform nodes and partner operators, Joomo chose the Stellar (XLM) network — purpose-built financial infrastructure with 3–5 second finality, native multi-asset support, and a decentralized exchange (SDEX) for on-chain currency conversion. This experience directly informed the cross-border settlement architecture that powers CallJots today.
2025: CallJots — Everything Converges
CallJots represents the convergence of everything Joomo has built over sixteen years: carrier-grade VoIP infrastructure, battle-tested CDR and billing engineering, state-of-the-art AI transcription, and crypto-native payment rails. The platform fuses a SIP/RTP/WebRTC call core with a real-time Whisper + Conformer ASR pipeline, BART/T5 abstractive summarization, and GMM-HMM speaker diarization — all billed per-minute through Bitcoin Lightning and settled on Stellar XLM.
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CallJots Product Overview
CallJots (calljots.com) is the AI-powered VoIP platform where every call automatically becomes searchable, timestamped smart notes. It is designed for professionals, teams, and businesses who need perfect recall of every conversation without the friction of manual note-taking.
Core Features
Real-Time AI Transcription:** Whisper + Conformer ASR models trained on telephony audio transcribe while you talk — zero post-call processing wait. Notes appear as words are spoken, handling accents and mixed languages with accuracy benchmarked against wav2vec 2.0 baselines on real call-centre audio. Supports 8 kHz PSTN-quality to 48 kHz WebRTC wideband streams.
AI Smart Summaries:** BART and T5 transformer models perform abstractive summarization — not just keyword extraction, but genuine comprehension of call context. Decisions, tasks, deadlines, and commitments surface automatically as structured bullet points. BERT/RoBERTa classifies intent and flags action items for follow-up.
Speaker Diarisation:** GMM-HMM speaker models segment and label every transcript line by speaker identity. Multi-party conference calls with up to 8 participants are correctly attributed, providing an auditable record of every commitment made on every call.
End-to-End Security:** Every media stream is encrypted via SRTP + DTLS-SRTP (RFC 3711 / RFC 5763). Call notes and transcripts are encrypted at rest using AES-256. All API traffic travels over TLS 1.3. Key exchange uses ephemeral ECDH, ensuring forward secrecy.
Time-Based Call Browser:** Every call is indexed by date, time, duration, participants, and AI-extracted keywords — stored in a structured CDR-style record that can be searched, filtered, and browsed by week, day, or exact timestamp.
Crypto-Native Billing:** Pay per-minute with Bitcoin/Lightning — satoshi-denominated micropayments with sub-second settlement. Inter-platform settlement runs on Stellar XLM with 3–5 second finality across 180+ countries and near-zero transaction fees. No banks, no intermediaries, no borders.
Pricing
Starter** — Free forever: 30 mins/month transcription, 7-day call history, basic AI notes
Pro** — $19/month or ~0.00028 BTC: unlimited transcription, 90-day history, full AI smart notes, speaker diarisation, export to PDF/CSV/Markdown, BTC + XLM payments
Team** — $49/month for up to 10 users: everything in Pro plus unlimited history, shared workspace, admin dashboard, API access, priority support
Matrix VoIP Expansion
Joomo is also building a privacy-first, end-to-end encrypted VoIP chat application on the Matrix protocol — integrating with Synapse homeservers, Element Call (LiveKit SFU), Kamailio SIP Router, RTPEngine, and Coturn TURN servers. This extends the CallJots ecosystem beyond traditional SIP into decentralized, federated communications.
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Technology Stack
Application Layer:** WebRTC, SIP/SDP, REST API, HTTPS/TLS 1.3
Media & Signalling Layer:** RTP/SRTP, DTLS-SRTP, ICE/STUN/TURN, Opus codec
AI & Intelligence Layer:** Whisper ASR, Conformer, BART, T5, BERT/RoBERTa, wav2vec 2.0
Payments & Settlement Layer:** Bitcoin, Lightning Network, Stellar XLM, SDEX
Infrastructure Layer:** Docker, Kubernetes, MySQL 8, Redis
Framework:** CodeIgniter 4 (CI4), AngularJS
Matrix Stack:** Synapse, Element, Kamailio, RTPEngine, Coturn, Whisper Bot
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Our Philosophy
Joomo Enterprises was built on the principle that carrier-grade reliability and cutting-edge innovation are not mutually exclusive. Every protocol integrated, every carrier connection provisioned, and every byte of CDR data processed over sixteen years of operations shaped the platform that CallJots users experience today.
We don't bolt crypto onto legacy billing — we redesign from scratch. We don't wrap AI around basic recording — we build transcription into the real-time media path. We don't compromise on security — we treat it as a protocol requirement, not a feature checkbox.
CallJots is the result: calls where the notes matter.