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Carrier

The carrier delivers the phone call to Patter. Patter supports Twilio and Telnyx with full feature parity (DTMF, call transfer, recording, AMD, status callbacks, cost tracking). You configure one carrier per Patter instance by passing an instance to the carrier= keyword argument. Each carrier class falls back to environment variables when constructor arguments are omitted. Each carrier ships as both a flat alias (from getpatter import Twilio) and a namespaced class (from getpatter.carriers import twilio → twilio.Carrier()). They are equivalent.

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Twilio

from getpatter import Patter, Twilio

phone = Patter(carrier=Twilio(), phone_number="+15550001234")   # reads env
# Or explicitly:
phone = Patter(
    carrier=Twilio(account_sid="AC...", auth_token="..."),
    phone_number="+15550001234",
)
ParameterTypeDefaultDescription
account_sidstr""Twilio Account SID (starts with AC). Reads from TWILIO_ACCOUNT_SID when empty.
auth_tokenstr""Twilio Auth Token. Reads from TWILIO_AUTH_TOKEN when empty.
Namespaced form: 
from getpatter.carriers import twilio

carrier = twilio.Carrier()                            # reads env
carrier = twilio.Carrier(account_sid="AC...", auth_token="...")
On serve(), Patter automatically sets the voice_url on the Twilio number to https://<webhook_url>/webhooks/twilio/voice via the Twilio REST API — no manual Console configuration needed.

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Signature verification

The Auth Token is also used to verify every Twilio webhook with HMAC-SHA1 against the X-Twilio-Signature header. Requests with invalid signatures are rejected with HTTP 403.

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Telnyx

from getpatter import Patter, Telnyx

phone = Patter(carrier=Telnyx(), phone_number="+15550001234")    # reads env
# Or explicitly:
phone = Patter(
    carrier=Telnyx(
        api_key="KEY...",
        connection_id="2000000000000000000",
        public_key="...",  # optional — enables Ed25519 signature verification
    ),
    phone_number="+15550001234",
)
ParameterTypeDefaultDescription
api_keystr""Telnyx API v2 key. Reads from TELNYX_API_KEY when empty.
connection_idstr""Call Control Application ID. Reads from TELNYX_CONNECTION_ID when empty.
public_keystr""Optional. Ed25519 public key for webhook signature verification. Reads from TELNYX_PUBLIC_KEY when empty.
Namespaced form: 
from getpatter.carriers import telnyx

carrier = telnyx.Carrier()                            # reads env

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Signature verification

When public_key is set (or TELNYX_PUBLIC_KEY is present), every Telnyx webhook is verified with Ed25519. Requests older than 5 minutes are rejected (replay protection).

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Webhook Endpoints

The embedded server exposes these endpoints regardless of carrier choice:
EndpointPurpose
POST /webhooks/twilio/voiceIncoming Twilio call → returns TwiML to start streaming.
POST /webhooks/twilio/statusCall lifecycle status callbacks (initiated, ringing, answered, completed).
POST /webhooks/twilio/recordingRecording completion callbacks.
POST /webhooks/twilio/amdAsync AMD (answering machine detection) results.
POST /webhooks/telnyx/voiceIncoming Telnyx call → returns Call Control commands.

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What’s Next

STT

Speech-to-text providers.

LLM

Language model providers.

TTS

Text-to-speech providers.

Tunneling

Expose your local server publicly.