"Building voice agents and controlling SIP phones" matching MCP servers:

Agent Toolkit for Mercado Pago

Enables managing AI voice agents, phones, integrations, workflows, calls, and billing directly from chat, including editing agent settings, connecting CRMs, and reviewing call logs.

MCP server that lets Claude place outbound telephone calls via ElevenLabs Agents over a SIP trunk and report the outcome including status, success evaluation, summary, and transcript.

Automatically transcribes Google Chat voice messages using Groq Whisper API, and also supports local audio file transcription.

Public read-only MCP server for FoxTrove Voice, enabling LLMs to query call logs, customer records, assistant stats, and analytics via secure OAuth.

A Model Context Protocol server that enables AI assistants like Claude to initiate and manage real-time voice calls using Twilio and OpenAI's voice models.

Enables AI agents to place VoIP phone calls via Asterisk, play TTS messages, capture DTMF input, and optionally record and transcribe voice responses.

MCP server enabling AI companions to deliver authored inner monologues alongside replies via atomically submitted batches.

Provides a unified context per contact across voice (NL Pearl v2) and custom WhatsApp/SMS channels, with MCP tools to resolve identity, retrieve timeline, upsert contacts, append interactions, manage signals, record call context, and suggest follow-ups.

Relays a result screenshot to Slack so you can review a coding agent's output without opening the app.

Access your Carbon Voice conversations and voice memos—retrieving messages, conversations, voice memos, and more as well as send messages to Carbon Voice users.

Enables AI agents to discover each other and communicate through cryptographically verified messaging and secure inbox management via the Agents Registry. It provides tools for Ed25519-based identity authentication, message signing, and agent discovery across domains.

基于MCP协议的聊天桥接服务器，允许多个AI Agent接入同一个聊天室进行对话协作。

Enables Poke to trigger outbound AI phone calls through Vapi telephony, using a stateless server with installer-owned credentials.

Enables AI assistants to conduct phone interviews, deliver notifications, and manage HR communications through natural voice conversations using Twilio, Deepgram, and OpenAI.

MCP server for agent-to-agent communication over NATS with live session push via Claude Code Channels.

MCP server for BubblyPhone that lets AI assistants make real phone calls, manage AI voice agents, buy phone numbers in 30+ countries, and track billing. Supports 20 tools for full telephony control.

Enables comprehensive Google Meet and Calendar management through Google Calendar API v3 and Google Meet API v2, supporting calendar event creation with Meet links, space management, transcription, recording, attendance tracking, and meeting moderation controls.

First Voice AI MCP for AI Agents

Enables AI agents to initiate and control outbound telephone calls and answer inbound calls through Telnyx and LiveKit, with realtime voice conversations powered by Gemini Live or OpenAI Realtime.