# OneNET Voice Call Service (VCS) API

**Canonical:** https://apis.io/apis/china-mobile/onenet-voice-call-service/  
**Provider:** China Mobile — https://apis.io/providers/china-mobile/  
**Base URL:** https://openapi.heclouds.com  
**Documentation:** https://open.iot.10086.cn/doc/iot_platform/book/vcs/vcs_api/request.html

OneNET Voice Call Service (VCS) API is one of 6 APIs that [China Mobile](https://apis.io/providers/china-mobile/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Voice, Click to Dial, CAMARA, Network APIs, and China. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

语音通话 (Voice Call Service) is China Mobile's publicly documented voice capability on the OneNET gateway, reached at https://openapi.heclouds.com/vcs?action={voiceNotify|dialNotify}&version=2. Click to dial (点击拨号) connects a caller and a callee across the China Mobile network; voice notification (语音通知) plays an approved TTS template to a subscriber and can collect DTMF digits. Both return a call_id and both deliver call-status callbacks to a caller-supplied notify_url, with documented status and disconnect-reason enumerations. Click to Dial is the domestic first-party product behind the CAMARA Click to Dial API that China Mobile sponsors upstream with Huawei — the shipped product does not implement the CAMARA schema or its OIDC/CIBA security model. Access is gated three ways — business entitlement, a test account pinned to an approved source IP, and a trial-usage quota. Service numbers and TTS templates require qualification review before use.

## Machine-readable artifacts (7)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/china-mobile/refs/heads/main/openapi/china-mobile-vcs-openapi.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/china-mobile/refs/heads/main/overlays/china-mobile-vcs-overlay.yaml
- **Documentation** — https://open.iot.10086.cn/doc/iot_platform/book/vcs/vcs_api/request.html
- **APIReference** — https://open.iot.10086.cn/doc/iot_platform/book/vcs/vcs_api/ctd.html
- **ErrorCatalog** — https://open.iot.10086.cn/doc/iot_platform/book/vcs/vcs_api/errorcode.html
- **Webhooks** — https://open.iot.10086.cn/doc/iot_platform/book/vcs/vcs_api/ctd-status.html
- **TermsOfService** — https://open.iot.10086.cn/doc/iot_platform/book/agreement/vcs-service-agreement.html

## Other China Mobile APIs (5)

- [OneNET Studio Application API](https://apis.io/apis/china-mobile/onenet-studio-application-api/)
- [OneNET IoT Open Platform API](https://apis.io/apis/china-mobile/onenet-iot-platform/)
- [China Mobile IoT Card Capability Open Platform API](https://apis.io/apis/china-mobile/iot-card-capability-platform/)
- [China Mobile Communication Capability Open Platform](https://apis.io/apis/china-mobile/communication-capability-platform/)
- [China Mobile Internet Capability Open Platform](https://apis.io/apis/china-mobile/internet-capability-open-platform/)

## Tags

Voice, Click to Dial, CAMARA, Network APIs, China

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/china-mobile/onenet-voice-call-service/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/china-mobile/.