Platforms and technologies

Twilio, Zoom Phone, FreePBX, n8n and the rest of the stack.

The voice, messaging, automation and integration platforms I work with every day. Each entry explains where it fits, what discovery establishes and what delivery depends on.

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Names are listed in plain text. No partnership, certification, reseller status or endorsement is claimed for any platform. Platform features, availability and pricing change, and are verified against official documentation during each project.

Voice and telephony

Twilio

Programmable voice, SMS, WhatsApp and Verify APIs for building calling and messaging into your own systems.

Used in: Enterprise VoIP Solutions, Twilio Solutions, SIP Trunking, AI Voice Agents, n8n Workflow Automation, Business SMS Solutions, A2P 10DLC Registration, Toll-Free SMS, SMS Campaign Setup, WhatsApp Business API, Call Center Infrastructure, API Development & Integrations, CRM Integrations
Discovery establishes: Countries, number types, sender registration, regulatory bundles and integration points.
Depends on: Carrier rules, country regulations and Twilio usage pricing.

Zoom Phone

Cloud phone system inside Zoom, with auto receptionists, call queues and Bring Your Own Carrier.

Used in: Enterprise VoIP Solutions, Zoom Phone, Call Center Infrastructure, CRM Integrations
Discovery establishes: Licences, sites, numbers, devices and carrier arrangements.
Depends on: Country availability and supported carrier configurations.

Google Voice

Business calling for Google Workspace, managed from the Workspace admin console.

Used in: Enterprise VoIP Solutions, Google Voice
Discovery establishes: Voice edition, countries and call routing needs.
Depends on: Edition features and country availability.

Dialpad

Cloud phone and contact center platform with built-in AI transcription.

Used in: Enterprise VoIP Solutions, Dialpad, CRM Integrations
Discovery establishes: Teams, routing, integrations and recording policies.
Depends on: Plan features and integration availability.

FreePBX

Web-administered open-source PBX built on Asterisk for self-hosted phone systems.

Used in: Enterprise VoIP Solutions, SIP Trunking, FreePBX, Technical Operations
Discovery establishes: Hosting, users, trunks, security and administration ownership.
Depends on: Project releases, module support and server maintenance.

Asterisk

The open-source telephony engine underneath FreePBX, VICIdial and many custom voice systems.

Used in: SIP Trunking, FreePBX, Call Center Infrastructure, Technical Operations
Discovery establishes: Dial plans, channels, codecs and integration needs.
Depends on: Version support and server administration.

SIP Trunking

The signalling protocol that connects PBXs, dialers and cloud platforms to carriers.

Used in: Enterprise VoIP Solutions, Zoom Phone, SIP Trunking, FreePBX, AI Voice Agents, Call Center Infrastructure
Discovery establishes: Carriers, concurrency, codecs, NAT, security and routing.
Depends on: Carrier configuration and network behaviour.

VICIdial

Open-source contact center suite for inbound, outbound and blended campaigns with predictive dialing.

Used in: Call Center Infrastructure, Technical Operations
Discovery establishes: Agent count, campaigns, dialing rules, recording and reporting.
Depends on: Server sizing, carrier capacity and dialing regulations.

Messaging

WhatsApp Business API

The WhatsApp Business Platform for multi-agent conversations, templates and automation at scale.

Used in: n8n Workflow Automation, WhatsApp Business API
Discovery establishes: Use cases, opt-in collection, templates and the provider to use.
Depends on: Meta verification, template approval and conversation pricing.

A2P 10DLC (The Campaign Registry)

The US registration system for brands and campaigns sending SMS from local 10-digit numbers.

Used in: Business SMS Solutions, A2P 10DLC Registration, SMS Campaign Setup
Discovery establishes: Brand details, use cases, opt-in evidence and sample messages.
Depends on: Carrier review policies and vetting requirements.

AI and automation

n8n

Workflow automation that can be self-hosted, connecting applications, APIs and AI steps.

Used in: AI Automation, n8n Workflow Automation, SMS Campaign Setup, WhatsApp Business API, API Development & Integrations, CRM Integrations
Discovery establishes: Hosting preference, licence fit and the applications involved.
Depends on: Licence terms, node availability and API changes in connected apps.

OpenAI

Language and speech models used for classification, extraction, drafting, tool use and voice.

Used in: AI Automation, AI Voice Agents, n8n Workflow Automation
Discovery establishes: Which tasks need a model, what data is sent and which data terms apply.
Depends on: Model versions, usage limits and pricing change over time.

Claude (Anthropic)

Language models used for analysis, drafting and tool use, including through the Model Context Protocol.

Used in: AI Automation
Discovery establishes: Task fit, data handling requirements and access method.
Depends on: Model availability and terms set by Anthropic.

Vapi

Platform for building AI voice agents from speech, model and telephony components.

Used in: AI Voice Agents
Discovery establishes: Call types, telephony connection and tool integrations.
Depends on: Telephony and model provider choices.

Retell AI

Voice agent platform for natural, low-latency phone conversations.

Used in: AI Voice Agents
Discovery establishes: Call flows, number setup and system integrations.
Depends on: Telephony configuration and platform limits.

ElevenLabs

Speech synthesis and voice tools used to give voice agents natural-sounding voices.

Used in: AI Voice Agents
Discovery establishes: Voices, languages and usage rights.
Depends on: Voice usage terms and consent requirements.

APIs and integration

REST APIs

The standard way systems exchange data: the backbone of every CRM, telephony and ERP integration.

Used in: Twilio Solutions, AI Automation, n8n Workflow Automation, Business SMS Solutions, API Development & Integrations, CRM Integrations, Odoo ERP, Website Development
Discovery establishes: Endpoints, authentication, rate limits and data models of each system.
Depends on: API versioning and provider changes.

Webhooks

Real-time event notifications, such as a call ending or a message arriving, that trigger workflows instantly.

Used in: Twilio Solutions, AI Automation, n8n Workflow Automation, Business SMS Solutions, WhatsApp Business API, API Development & Integrations, CRM Integrations
Discovery establishes: Events available, payloads, signatures and retry behaviour.
Depends on: Endpoint availability and signature validation.

Business platforms

Odoo ERP

Open-source ERP covering CRM, sales, inventory, invoicing, helpdesk and more in one system.

Used in: API Development & Integrations, Odoo ERP
Discovery establishes: Edition, modules, hosting and data migration scope.
Depends on: Edition features and version upgrades.

Cloud and publishing

AWS

Cloud compute, storage and networking for telephony servers, integrations and applications.

Used in: Technical Operations, Cloud Solutions
Discovery establishes: Workloads, regions, access and cost controls.
Depends on: Service pricing and account configuration.

DigitalOcean

Straightforward cloud servers well suited to PBX, n8n and small application hosting.

Used in: Technical Operations, Cloud Solutions
Discovery establishes: Sizing, region and backup requirements.
Depends on: Droplet pricing and regional availability.

Amazon KDP

Amazon’s self-publishing platform for eBooks and print-on-demand books.

Used in: Amazon KDP Publishing
Discovery establishes: Formats, rights, pricing and enrolment choices.
Depends on: File specifications and content policies.

IngramSpark

Print-on-demand and distribution to bookstores and libraries.

Used in: IngramSpark Publishing
Discovery establishes: Formats, ISBNs and distribution settings.
Depends on: File specifications and account terms.

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