# SIP trunking with Bird Voice

## 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](/docs/guides/voice/sip-trunks)

[Explore Voice sip trunking →](/docs/guides/voice/sip-trunks)

[Incoming calls Route calls to the right destination. →](/voice-api/features/inbound-routing)

[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)

[Explore Voice →](/voice-api)

## 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)

## 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)