Sinch

Registers US 10DLC brands and campaigns with Sinch for A2P SMS messaging. Use when the user needs to register a brand, create a 10DLC campaign, check registration status, troubleshoot a 10DLC rejection, fix an EIN mismatch, upgrade from simplified to full registration, or qualify a campaign for US SMS sending on 10-digit long codes. Do NOT use for non-US messaging or toll-free/short code registration.

Configures Sinch API credentials and authentication. Use when setting up OAuth2, Basic auth, application signing, or API keys for any Sinch product including Conversation API, Voice, Verification, Numbers, Fax, and Mailgun. Also use when troubleshooting 401 Unauthorized, 403 Forbidden, invalid signature, or credential errors against any Sinch API. For SDKs usage, see sinch-sdks.

Sends and receives omnichannel messages with Sinch Conversation API. One unified API for SMS, WhatsApp, RCS, MMS, Viber, Messenger, and more. Use when sending texts, WhatsApp messages, rich cards, carousels, templates, batch messages, or building multi-channel messaging.

Provisions SIP trunks, endpoints, ACLs, credential lists, and phone numbers via the Sinch Elastic SIP Trunking REST API. Use when the user needs SIP connectivity, trunk provisioning, inbound/outbound PSTN voice routing, PBX integration, or SIP-to-PSTN bridging.

Send and receive faxes programmatically with Sinch Fax API. Use when building fax workflows, fax-to-email delivery, sending PDFs by fax, checking fax status, managing fax services, configuring cover pages, receiving fax webhooks, or integrating fax into healthcare, legal, or financial applications.

Integrate Sinch In-App Voice and Video SDK for real-time calling in Android, iOS, or JavaScript apps. Use when the user mentions In-App Calling, VoIP integration, WebRTC with Sinch, app-to-phone calling, video calling, or building voice/video features in a mobile or web app.

Sends, receives, and tracks email via the Mailgun (Sinch) API. Use when the user wants to send email, manage domains, configure webhooks, query email events/logs, manage templates, handle suppressions (bounces, unsubscribes, complaints), set up inbound routes, manage mailing lists, DKIM keys, or IP warmup using Mailgun.

Checks email quality before sending via Mailgun Inspect API. Use when previewing emails across clients, checking accessibility (WCAG), validating links, validating images, or analyzing email HTML/CSS compatibility.

Monitors email deliverability via Mailgun Optimize (InboxReady) API. Use when the user wants to test inbox placement with seed lists, monitor IP or domain blocklists, track spam traps, check email health scores, review DMARC reports, or pull Google Postmaster or Microsoft SNDS data. Also use when emails are going to spam, sender reputation is dropping, inbox rate is declining, a domain needs warmup monitoring, an IP needs blocklist removal, or the user wants to set up email deliverability monitoring.

Build with Mailgun Validate API for email verification and list hygiene. Use when validating email addresses, checking email deliverability, running bulk validation jobs, previewing list health, or cleaning an email list.

Looks up phone number details via Sinch Number Lookup API. Use when checking carrier, line type, porting status, SIM swap, VoIP detection, or reassigned number detection (RND) for fraud prevention or routing decisions.

Search, rent, manage, and release phone numbers with the Sinch Numbers API. Use when listing active numbers, searching available numbers, renting or releasing numbers, updating number configuration (SMS/voice/callback), managing emergency addresses, or checking available regions.

Provisions and manages channel resources for Conversation API projects, including WhatsApp accounts/senders/templates, RCS senders, KakaoTalk senders/templates, webhooks, and bundles. Use when the user asks to onboard channels, configure provisioning webhooks, manage templates, orchestrate multi-service bundles, or automate channel setup.

Verify phone numbers via SMS, Flashcall, Phone Call, Data (seamless carrier-level), or WhatsApp with Sinch Verification API. Use when implementing user phone verification, OTP, two-factor authentication, or number ownership confirmation flows.

Build voice apps with Sinch Voice REST API. Use for phone calls, text-to-speech (TTS), IVR menus, DTMF input, conference calling, call recording, call forwarding, answering machine detection (AMD), SIP routing, WebSocket audio streaming, and SVAML call control.