AgentLine

Overview

AgentLine gives AI agents US and Canada phone numbers that make and receive calls and send and receive SMS. A hosted voice agent runs each call from your prompt, and a relay can feed it live context from your own runtime. The server is open source under the MIT license (github.com/AgentLineHQ/AgentLine) and can be self-hosted with Docker; agentline.cloud is the hosted version. It has no iMessage or RCS support.

Key features

• Outbound and inbound AI voice calls with transcripts, IVR navigation by DTMF and voicemail drop
• SMS and MMS on the same number as calls
• Call transfer to the owner's phone, and an owner task mode for phoning in instructions
• Agent Relay over an outbound WebSocket for Hermes, OpenClaw, Claude Code and Codex, with replay of unacknowledged events
• HMAC-SHA256 signed webhooks and a fallback event mailbox
• Hosted MCP server with 21+ tools, a Python SDK and a LangChain toolkit
• Self-hosted carriers: SignalWire, Twilio, Plivo, Telnyx or your own class

Pricing

Hosted plans are Individual at $20 a month (1 number, 100 minutes, 400 SMS), Scale at $50 (3 numbers, 200 minutes, 1,000 SMS) and Startup at $200 (12 numbers, 1,000 minutes, 3,000 SMS). Past the plan, extra numbers cost $3 a month, calls $0.12 a minute and SMS $0.02 each. Self-hosting is free software; you pay your carrier, speech and model providers.

How it compares to Linq

Linq sends iMessage, RCS and SMS from managed lines; AgentLine covers SMS, MMS and voice only. AgentLine's hosted voice agent places and answers calls, while Linq's docs say its API does not place or answer calls. Linq is a closed, fully managed platform with flat pricing and no per-message fees; AgentLine's server is MIT-licensed and self-hostable, and its hosted plans bill usage past the allowance. Both offer an MCP server and a Python SDK.

Best for

Developers who want an AI agent to hold phone conversations and text from a US or Canada number, including teams that want to self-host it on their own carrier account.

Sources

• agentline.cloud
• agentline.cloud/llms.txt
• agentline.cloud/skill.md
• agentline.cloud/pricing
• agentline.cloud/pricing.md
• agentline.cloud/terms
• agentline.cloud/privacy
• docs.agentline.cloud/introduction
• docs.agentline.cloud/guides/messages
• docs.agentline.cloud/guides/numbers
• docs.agentline.cloud/guides/webhooks
• docs.agentline.cloud/guides/events
• docs.agentline.cloud/guides/relay
• docs.agentline.cloud/guides/mcp
• docs.agentline.cloud/sdk/python
• docs.agentline.cloud/sdk/node
• api.agentline.cloud/openapi.json
• github.com/AgentLineHQ/AgentLine
• github.com/AgentLineHQ/langchain-agentline
• agentline.cloud/blog/integrate-agentline-nocode-automation