How do I install the Sinch API Voice Callout skill?

Run npx skillmds@latest add sinch/sinch-api-voice-callout in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Sinch API Voice Callout skill do?

Make an outbound voice call (TTS callout) via Sinch Voice API It is listed under Integrations & APIs on SkillMD.

Is Sinch API Voice Callout safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: makes network calls, reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Sinch API Voice Callout?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Sinch API Voice Callout free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Sinch API Voice Callout?

sinch (@sinch) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Sinch API Voice Callout by sinch — Agent Skill

Name: Sinch API Voice Callout
Rating: 4.666666666666667 (3 reviews)
Author: sinch

File contents

Voice Callout (TTS Call)

Place an outbound voice call using the Sinch Voice API. Supports text-to-speech (TTS) callouts to a phone number. Uses Application Key + Secret (not Conversation API credentials).

IMPORTANT: Execute this command directly. Do NOT generate script files. Perform the API call immediately.

Input

--to / -t: Destination phone number (E.164) - required
--text / -T: Text to be spoken (TTS) - required
--cli / -c: Caller ID / CLI (E.164) - optional
--locale / -l: TTS locale (e.g. en-US) - optional, default en-US

Arguments: $ARGUMENTS

Instructions

Execute these steps directly - do not write code or scripts:

If $ARGUMENTS empty: ask for destination number, text to speak, optional caller ID and locale. Otherwise parse.
Validate: --to (E.164), --text (non-empty). Optional: --cli (E.164), --locale.
Get VOICE_APPLICATION_KEY and VOICE_APPLICATION_SECRET from env (or equivalent Voice app credentials). Voice API uses Application Key/Secret, not OAuth2. If missing, report "Voice API is not configured. Set VOICE_APPLICATION_KEY and VOICE_APPLICATION_SECRET."
Request body: method "ttsCallout", ttsCallout: destination (type "number", endpoint), cli, locale, text.
POST https://calling.api.sinch.com/calling/v1/callouts with Basic Auth (ApplicationKey:ApplicationSecret) or signed request, Content-Type application/json.
On success: "✅ Call initiated" with call ID. Handle 400, 401, 403 with clear messages.
Handle all errors gracefully.

Examples

/sinch-api-voice-callout --to=+14155551234 --text="Hello, this is a test call from Sinch."
/sinch-api-voice-callout -t +14155551234 -T "Your verification code is 1 2 3 4" --locale=en-US

API Reference

Base URL: https://calling.api.sinch.com/calling/v1
Endpoint: POST /callouts
Auth: Basic (application key:secret) or Application Signed Request
Documentation: https://developers.sinch.com/docs/voice/

Notes

Voice API uses Application Key + Secret from Voice app in Sinch Dashboard, not project OAuth2.
Regional endpoints available: calling-use1, calling-euc1, calling-apse1, etc.

---name: sinch-api-voice-calloutdescription: Make an outbound voice call (TTS callout) via Sinch Voice API---# Voice Callout (TTS Call)Place an outbound voice call using the Sinch Voice API. Supports text-to-speech (TTS) callouts to a phone number. Uses Application Key + Secret (not Conversation API credentials).**IMPORTANT: Execute this command directly. Do NOT generate script files. Perform the API call immediately.**## Input- `--to` / `-t`: Destination phone number (E.164) - required- `--text` / `-T`: Text to be spoken (TTS) - required- `--cli` / `-c`: Caller ID / CLI (E.164) - optional- `--locale` / `-l`: TTS locale (e.g. en-US) - optional, default en-USArguments: $ARGUMENTS## Instructions**Execute these steps directly - do not write code or scripts:**0. If $ARGUMENTS empty: ask for destination number, text to speak, optional caller ID and locale. Otherwise parse.1. Validate: --to (E.164), --text (non-empty). Optional: --cli (E.164), --locale.2. Get VOICE_APPLICATION_KEY and VOICE_APPLICATION_SECRET from env (or equivalent Voice app credentials). Voice API uses Application Key/Secret, not OAuth2. If missing, report "Voice API is not configured. Set VOICE_APPLICATION_KEY and VOICE_APPLICATION_SECRET."3. Request body: method "ttsCallout", ttsCallout: destination (type "number", endpoint), cli, locale, text.4. POST https://calling.api.sinch.com/calling/v1/callouts with Basic Auth (ApplicationKey:ApplicationSecret) or signed request, Content-Type application/json.5. On success: "✅ Call initiated" with call ID. Handle 400, 401, 403 with clear messages.6. Handle all errors gracefully.## Examples```/sinch-api-voice-callout --to=+14155551234 --text="Hello, this is a test call from Sinch."/sinch-api-voice-callout -t +14155551234 -T "Your verification code is 1 2 3 4" --locale=en-US```## API Reference- **Base URL**: https://calling.api.sinch.com/calling/v1- **Endpoint**: POST /callouts- **Auth**: Basic (application key:secret) or Application Signed Request- **Documentation**: https://developers.sinch.com/docs/voice/## Notes- Voice API uses Application Key + Secret from Voice app in Sinch Dashboard, not project OAuth2.- Regional endpoints available: calling-use1, calling-euc1, calling-apse1, etc.

Frequently asked questions

Sinch API Voice Callout