Sinch Numbers API

Overview

The Numbers API lets you search, activate, manage, and release phone numbers — the prerequisite for SMS, Voice, and Conversation APIs.

Agent Instructions

Before generating code, gather from the user (skip any item already specified in the prompt or context):

1. Approach — SDK or direct API calls (curl/fetch/requests)? Default to SDK if @sinch/sdk-core (Node), sinch (Python), or com.sinch.sdk (Java) is already present in the project.
2. Language — for SDK: Node.js, Python, Java, or .NET. For direct API: any language, or curl.

When the user chooses SDK, refer to the sinch-sdks skill for installation and client initialization, then to the bundled language references and SDK reference linked in Links.

When the user chooses direct API calls, refer to the Numbers API Reference linked in Links for request/response schemas.

Security: See the Security section below for url fetching policy, handling inbound callback content, and credential handling.