Returns all SIP trunks configured on the 3CX system. Each trunk has: Id, Number, Name, IsOnline (registration status), Direction, SimultaneousCalls. Use get_trunk_details with the Id for full configuration details.
AI agents call list_trunks to retrieve information from 3CX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists existing SIP trunk configuration data without any side effects. It is a passive information-gathering operation that queries system state. The worst outcome of misuse would be exposing trunk configuration details (a confidentiality concern), but not operational harm, resource consumption, or system modification. Low severity appropriate for read operations on administrative metadata.
From the tool's definition Tool name 'list_trunks' and description state it 'Returns all SIP trunks configured' — a query operation with no modification, deletion, execution, or financial action. Returns read-only status fields: Id, Number, Name, IsOnline, Direction, SimultaneousCalls.
Attacks that exploit this kind of access
Returns all SIP trunks configured on the 3CX system. Each trunk has: Id, Number, Name, IsOnline (registration status), Direction, SimultaneousCalls. Use get_trunk_details with the Id for full configuration details. It is categorised as a Read tool in the 3CX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the 3CX MCP Server MCP server in PolicyLayer and add a rule for list_trunks: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches 3CX MCP Server. Nothing to install.
list_trunks is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_trunks rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_trunks. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_trunks is provided by the 3CX MCP Server MCP server (ssig-it/3cx-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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