# osis-co Calls API

**Canonical:** https://apis.io/apis/osis-co/osis-co-calls-api/  
**Provider:** osis-co — https://apis.io/providers/osis-co/  
**Base URL:** https://osis.co/api/v1/comms  
**Documentation:** https://docs.osis.co/messages-api/overview

osis-co Calls API is one of 11 APIs that [osis-co](https://apis.io/providers/osis-co/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 6 JSON Schema definitions. Tagged areas include Calls. The published artifact set on APIs.io includes an OpenAPI specification and 6 JSON Schemas.

The Calls API from osis-co — 11 operation(s) for calls.

## Operations (13)

| Method | Path | Summary |
|---|---|---|
| GET | `/lines/{e164}/call-forwarding` | Get call forwarding |
| PUT | `/lines/{e164}/call-forwarding` | Set call forwarding |
| GET | `/calls` | List calls |
| POST | `/calls` | Place a call |
| GET | `/calls/{id}` | Get a call |
| POST | `/calls/{id}/answer` | Answer a call |
| POST | `/calls/{id}/decline` | Decline a call |
| POST | `/calls/{id}/hangup` | Hang up a call |
| POST | `/calls/{id}/say` | Speak text on a call (TTS) |
| POST | `/calls/{id}/dtmf` | Send keypad tones |
| GET | `/calls/{id}/turns` | List call transcript turns |
| GET | `/calls/{id}/media` | Get a call's audio session |
| GET | `/calls/{id}/voicemail` | Download a voicemail |

## Machine-readable artifacts (7)

- **OpenAPI** — https://artifacts.apis.io/osis-co/openapi/osis-co-calls-api-openapi.yml
- **JSONSchema** — https://artifacts.apis.io/osis-co/json-schema/osis-co-send-message-request-schema.json
- **JSONSchema** — https://artifacts.apis.io/osis-co/json-schema/osis-co-call-schema.json
- **JSONSchema** — https://artifacts.apis.io/osis-co/json-schema/osis-co-merchant-status-schema.json
- **JSONSchema** — https://artifacts.apis.io/osis-co/json-schema/osis-co-send-contact-card-request-schema.json
- **JSONSchema** — https://artifacts.apis.io/osis-co/json-schema/osis-co-payment-request-schema.json
- **JSONSchema** — https://artifacts.apis.io/osis-co/json-schema/osis-co-message-schema.json

## Other osis-co APIs (10)

- [osis-co AI API](https://apis.io/apis/osis-co/osis-co-ai-api/)
- [osis-co Capabilities API](https://apis.io/apis/osis-co/osis-co-capabilities-api/)
- [osis-co Conversations API](https://apis.io/apis/osis-co/osis-co-conversations-api/)
- [osis-co Events API](https://apis.io/apis/osis-co/osis-co-events-api/)
- [osis-co Groups API](https://apis.io/apis/osis-co/osis-co-groups-api/)
- [osis-co Lines API](https://apis.io/apis/osis-co/osis-co-lines-api/)
- [osis-co Messages API](https://apis.io/apis/osis-co/osis-co-messages-api/)
- [osis-co Number Changes API](https://apis.io/apis/osis-co/osis-co-number-changes-api/)
- [osis-co Payments API](https://apis.io/apis/osis-co/osis-co-payments-api/)
- [osis-co Webhooks API](https://apis.io/apis/osis-co/osis-co-webhooks-api/)

## Tags

Calls

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/osis-co/osis-co-calls-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/osis-co/.