# Voice for developers Connect your phone system. Guide every call. Build voice into your customer experience. [Get started](/dashboard/signup?returnTo=%2Fdashboard%2Fw%2Fvoice%2Fonboarding) [Contact Sales](/demo?product=voice) [Read customer stories](/customers) [Explore Enterprise](/enterprise) - [Airwallex](/customers/airwallex) - [Glovo](/customers/glovo) - [Zillow](/customers/zillow) - Uber - [Binance](/customers/binance) - Adobe - Meta - PayPal - Pinterest - Square - [Al Jazeera](/customers/aljazeera) - [Aramex](/customers/aramex) - [Bazaar Technologies](/customers/bazaar) - [ComparaOnline](/customers/compara) - [Emma](/customers/emma) ## Your phone system. Connected through Bird. Bring your PBX or SIP client. Set the direction, authenticate the connection, and choose where calls can go. Outbound callsInbound calls Your phone system PBX or SIP client Bird SIP trunk TLS signaling · 5061 Customer phone +44 20 7946 0188 Outbound calls Use the SIP domain assigned to your trunk. Authentication Allowed API key Caller identity Verified caller ID Destination United Kingdom enabled Ready for an outbound call Your client places the call over SIP. Bird applies the trunk and account policies. Illustrative SIP configuration. No trunk settings change and no call is placed. [Caller IDs](/docs/guides/voice/caller-ids)[Incoming calls](/docs/guides/voice/receiving-calls) [Explore SIP trunks](/voice-api/features/sip-trunking) ## Your calls. In your workflow. Read current call activity from your app or agent. Inspect call records with MCP, CLI, SDKs or REST. **MCP**: `Bird MCP` ```json https://mcp.bird.com ``` ## A clear path. For every caller. Greet the caller, collect a keypad choice, and follow the selected branch. Try 1 or 2 to read the response in the transcript. SAY Welcome to Harbor GATHER How can we help? Keypad input Pressed 1 SAY Opening hours Pressed 2 SAY Collection details h ### Harbor Connected RESPONSE · PRESSED 2 Your collection is ready. Bring your order number when you visit. 123 4 5 6 7 8 9 * 0 # [Explore call sequences](/voice-api/features/call-sequences) ## Every call. A reason you can inspect. See when a call rang, when it connected, and how it ended. Keep answered time separate from the total duration. Call details `vcl_…2048` AnsweredNo answerRefused h Harbor Amsterdam +31 20 555 0188 Outbound AM Alex Morgan +44 20 7946 0188 Call activity 6s ringing · 36s connected 00:00 00:06 00:42 Started 14:32:04 Answered 14:32:10 Ended 14:32:46 Status Answered Total duration 00:42 Answered time 00:36 SIP response 200 ### The destination picked up. Six seconds of ringing, followed by 36 seconds connected. `Normal end of call` `voice_call.ended`Final outcome recorded Illustrative completed call records. Outcome controls inspect different examples; they do not place or retry calls. [Explore Voice events](/docs/guides/voice/events)[Explore the call log](/docs/guides/voice/call-log) ## Call volume. With the context behind it. Follow answer rates to a specific destination. Voice analytics ### Call volume and answer rate 5,614 calls 85.2% answer rate Answered calls Answer rate Unanswered Sep 21 · UTC 74.4% of unanswered calls in this hour United States 90 of 121 · 14:00–15:00 UTC #### By destination 14:00–15:00 UTC Destination | Calls | Unanswered | Share | United States | 229 | 90 | 74.4% | United Kingdom | 125 | 22 | 18.2% | Netherlands | 63 | 9 | 7.4% | [Explore Voice call logs](/docs/guides/voice/call-log) ## Explore Voice. From your first connection to the complete call flow. Explore the details. [Voice API Connect call records to your application and configure supported calling tools.](#integrate)[Call sequences Give callers a clear path to the answer they need.](/voice-api/features/call-sequences)[SIP trunking Connect your phone system to the telephone network.](/voice-api/features/sip-trunking)[Incoming calls Route calls to the right destination.](/voice-api/features/inbound-routing)[Browser phone Make a call directly from the dashboard.](/voice-api/features/browser-calling)[Recordings Find and play recordings from your call workflows.](/voice-api/features/recordings)[Caller IDs Verify the identity customers see when you call.](/docs/guides/voice/caller-ids)[Global calling Prepare destinations and limits before placing calls.](/docs/guides/voice/destinations)[Call logs Understand how a call started, connected and ended.](/docs/guides/voice/call-log)[Webhooks Let your application follow the call lifecycle.](/docs/guides/voice/events) ## Scale without losing control. Organize teams in workspaces, control API access, and trace changes through audit logs. Harbor Organization Workspaces Production Sandbox ### Delivery agent API key · Customer operations team Active Permissions Access Email Read & write SMS Read & write WhatsApp Read Read & write AL Alex Lee Admin Permissions updated ### Audit log Production API key updated Alex Lee · 09:42:18 UTC Workspace Production Resource Delivery agent WhatsApp Read Read & write Succeeded [Workspaces](/docs/guides/workspaces)[Team roles](/docs/guides/users-teams-roles)[API authentication](/docs/guides/authentication) [Explore Enterprise](/enterprise) Examples: [MCP](/de-de/voice-api.mcp.md) · [CLI](/de-de/voice-api.cli.md) · [TypeScript](/de-de/voice-api.ts.md) · [Python](/de-de/voice-api.py.md) · [Go](/de-de/voice-api.go.md) · [PHP](/de-de/voice-api.php.md) · [cURL](/de-de/voice-api.curl.md) ## Start with Voice. Build across channels with Bird. [Get started](/dashboard/signup?returnTo=%2Fdashboard%2Fw%2Fvoice%2Fonboarding) · [Contact Sales](/demo?product=voice) [Email](/email-api) · [SMS](/sms-api) · [WhatsApp](/whatsapp-api) · [Apple Messages](/apple-messages-api) · [Voice](/voice-api) ## Related resources - [Voice overview](/docs/guides/voice/overview) (docs) - [What is a voice API?](/explained/voice/what-is-a-voice-api) (answer) [Get an implementation brief](/learn/workspace?topic=voice)