> ## Documentation Index > Fetch the complete documentation index at: https://devdocs.aiconnected.ai/llms.txt > Use this file to discover all available pages before exploring further. # Complete Infrastructure Stack > Component Service Purpose : : : Phone System GoToConnect PSTN, call control, WebRTC Real time Audio LiveKit Cloud Room manageme... Normalized for Mintlify from `knowledge-base/aiconnected-apps-and-modules/modules/aiConnected-voice/complete-infra-stack.mdx`. # **Complete Infrastructure Stack** | Component | Service | Purpose | | :------------------- | :---------------------------- | :-------------------------------- | | **Phone System** | GoToConnect | PSTN, call control, WebRTC | | **Real-time Audio** | LiveKit Cloud | Room management, audio routing | | **TTS** | RunPod (Chatterbox) | Speech synthesis | | **STT** | Deepgram | Speech-to-text transcription | | **LLM** | Anthropic API (Claude) | Conversational AI brain | | **Platform Hosting** | DigitalOcean/Dokploy | Web app, API gateway, agents | | **Database** | PostgreSQL (on DO) | Tenants, configs, call logs | | **Cache/State** | Redis (on DO) | Session state, call state machine | | **Automation** | n8n (on DO) | Tool calling, CRM webhooks | | **Object Storage** | DO Spaces or S3 | Voice samples, recordings | | **Monitoring** | Grafana/Prometheus or Datadog | Logs, metrics, alerts | *** ## Monthly Cost Estimate (Starting) | Service | Est. Cost | | :------------ | :----------------------------- | | GoToConnect | \$17/user (grandfathered) | | LiveKit Cloud | \~\$50-100 (low volume) | | RunPod A5000 | \~\$197 | | Deepgram | \~\$50-100 (low volume) | | Anthropic API | \~\$100-300 (depends on usage) | | DigitalOcean | \~\$50-100 (droplets + spaces) | | **Total** | **\~\$500-800/mo to start** | ***