> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unpod.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Trunks

> Connect your carrier: register a SIP trunk and sync its numbers into Unpod.

A [Trunk](/get-started/core-concepts#trunk) is your carrier connection - the
SIP capacity phone numbers ride on. Numbers come from trunks: after you
register one, `client.numbers.sync()` discovers its numbers so you can attach
them to a [Speech Pipe](/speech-stack/pipes).

You bring your own carrier (Twilio, Tata, …) and register it once with its SIP
credentials. After that you work with numbers, not SIP.

## Register a trunk

```python theme={null}
from unpod import AsyncClient
from unpod.models import TrunkCreate, ByoConfigCreate

client = AsyncClient()

trunk = await client.trunks.create(TrunkCreate(
    name="tata-byo",
    type="byo",
    byo_config=ByoConfigCreate(
        provider="tata",
        sip_domain="sip.tata.in",
        auth_username="user",
        auth_password="secret",
        transport="tls",   # default
    ),
))
```

## List and delete

```python theme={null}
trunks = await client.trunks.list()
await client.trunks.delete(trunk.trunk_id)
```

## Then sync your numbers

```python theme={null}
result = await client.numbers.sync()   # {"synced": int, "new": int}
```

See [Numbers](/speech-stack/numbers) for attaching them, or follow
[Make Your First Phone Call](/get-started/first-phone-call) for the full
provisioning walk-through.