📞 VoiceTel Python SDK

The official Python client for the VoiceTel REST API — provision numbers, place orders, validate e911, send messages, and manage your account, all with type-safe, async-ready Python.

📚 Table of Contents

• Features
• Installation
• Quickstart
• Authentication
• Resource Reference
• Error Handling
• Async Support
• Rate Limits
• Development
• API Documentation
• Contributors
• Sponsors
• License

✨ Features

🛡️ Strongly Typed End-to-End

• Pydantic v2 models for every one of the 73 API operations — request bodies validated before they leave your machine, responses validated when they arrive.
• mypy-strict clean. Full type coverage, including async, generics, and discriminated unions.
• Autocomplete everywhere. Your IDE knows the shape of every field — no more guessing what's in result["data"]["numbers"].

⚡ Sync + Async, Same Surface

• Client for blocking calls, AsyncClient for await-based async — identical method names, identical return types.
• Built on httpx — supports HTTP/2, connection pooling, and custom transports if you need them.

🔁 Production-Grade Transport

• Automatic retry with exponential backoff on 429 / 5xx — honors Retry-After headers.
• Configurable timeouts per client or per call.
• Bearer auth managed for you; password→key exchange handled by client.login().
• Structured exception hierarchy — RateLimitError, AuthenticationError, NotFoundError, etc. all subclasses of ApiError you can catch broadly or narrowly.

📞 Complete API Coverage

• Numbers — list, get, add, remove, route, translate, CNAM, LIDB, fax, forward, SMS, messaging campaigns, port-out PIN, account moves.
• Account — profile, sub-accounts, CDRs, credits, payments, MRC, registration, password recovery.
• e911 — record provisioning, address validation, lookup, removal.
• Gateways — list, create, update, delete, view bound numbers.
• Messaging — SMS & MMS sending, message history, 10DLC brand and campaign registration, per-number messaging state.
• Lookups — CNAM and LRN dips.
• iNumbering — inventory search, coverage queries, number orders, port-in submissions, port-out availability checks.
• Support — ticket create / read / update / delete, threaded messages, replies.
• ACL — IP allowlist management with structured 409 conflict bodies.
• Authentication — switch between Digest, IP-only, or hybrid modes; rotate passwords.

🧪 Battle-Tested

• 108 unit tests at 100% statement + branch coverage.
• Integration test suite that runs read-only operations against api.voicetel.com — gated by env vars, safe for CI.
• No mocks-pretending-to-be-tests. Mocked HTTP layer with respx, real Pydantic validation on every fixture so spec drift gets caught.

📦 Clean Distribution

• Zero codegen footprint — every byte hand-written.
• Built with hatchling; ships as wheel + sdist.
• py.typed marker — downstream type checkers see your imports natively.

🚀 Installation

pip install voicetel-api

Requires Python 3.10 or later. Tested against 3.10, 3.11, 3.12, and 3.13.

🏁 Quickstart

from voicetel import Client

with Client() as c:
    # Exchange username + password for an API key (one-time per session)
    c.login(username=1000000001, password="hunter2")

    # Typed responses — your IDE knows what `me` is.
    me = c.account.get()
    print(f"Balance: ${me.cash:.2f}  |  Caller ID: {me.callerId}")

    # List your numbers
    for n in c.numbers.list().numbers:
        print(f"{n.number}  route={n.route}  cnam={n.cnam}  sms={n.smsEnabled}")

Or, if you already have an API key:

from voicetel import Client

with Client(api_key="32hex...") as c:
    coverage = c.inumbering.coverage(state="NJ")
    for bucket in coverage.coverage:
        print(f"{bucket.npa}-{bucket.nxx}: {bucket.count} TNs available")

🔑 Authentication

Every endpoint requires Authorization: Bearer <apikey> except POST /v2.2/account/api-key, which exchanges username + password for a fresh key. Client.login() (and AsyncClient.login()) handles the exchange and installs the returned key on the transport.

Re-fetch the API key after any password change — the old one is invalidated.

Don't have credentials yet? Get them at voicetel.com/docs/api/v2.2/credentials.

from voicetel import Client

with Client() as c:
    key = c.login(username=1000000001, password="hunter2")
    # `key` is the new 32-hex bearer; the client already has it installed.

🗺️ Resource Reference

Resource	Operations	Example
client.account	Profile, CDR, credits, payments, MRC, signup, recovery, sub-accounts	c.account.cdr(start=t1, end=t2)
client.acl	IP allowlist (CIDR entries)	c.acl.add(AclModifyRequest(acl=[...]))
client.authentication	SIP/HTTP auth mode + password	c.authentication.update(AuthPutRequest(authType=1))
client.e911	Records, address validation, provisioning	c.e911.validate(E911AddressRequest(...))
client.gateways	Termination routes	c.gateways.list()
client.inumbering	Inventory, orders, port-ins	c.inumbering.search_inventory(npa=201)
client.lookups	CNAM & LRN dips	c.lookups.lrn("2015551234", ani="2012548000")
client.messaging	SMS/MMS, 10DLC brands & campaigns	c.messaging.send(MessageSendRequest(...))
client.numbers	All operations on TNs on the account	c.numbers.assign_campaign("2015551234", ...)
client.support	Tickets, replies, attachments	c.support.create(TicketCreateRequest(...))

Every method that takes a request body accepts a typed Pydantic model imported from voicetel.models:

from voicetel import Client
from voicetel.models import (
    MessageSendRequest,
    NumberCampaignAssignRequest,
    PortSubmitRequest,
)

with Client(api_key=key) as c:
    sent = c.messaging.send(MessageSendRequest(
        fromNumber="2012548000",
        toNumber="2015551234",
        text="Your code is 482917",
    ))
    print(f"Sent: {sent.id}  ({sent.parts} segment(s))")

    c.numbers.assign_campaign(
        "2015551234",
        NumberCampaignAssignRequest(campaignId="CABC123"),
    )

🚨 Error Handling

All HTTP errors raise subclasses of voicetel.ApiError. Catch broadly or narrowly:

Status	Exception
400	BadRequestError
401	AuthenticationError
403	PermissionDeniedError
404	NotFoundError
409	ConflictError
429	RateLimitError
5xx	ServerError
other	ApiError

from voicetel import Client, NotFoundError, RateLimitError

with Client(api_key=key) as c:
    try:
        n = c.numbers.get("9999999999")
    except NotFoundError:
        print("That number isn't on your account.")
    except RateLimitError as e:
        print(f"Slow down — retry in {e.body.get('retryAfter', '?')}s")

⚡ Async Support

Identical surface to Client, with await-based methods:

import asyncio
from voicetel import AsyncClient

async def fetch_state(numbers: list[str]) -> None:
    async with AsyncClient(api_key="...") as c:
        state = await c.messaging.numbers_state(numbers=numbers)
        for s in state.numbers:
            print(f"{s.number}: network={s.network} campaign={s.campaign}")

asyncio.run(fetch_state(["2015551234", "2015551235"]))

⏱️ Rate Limits

These endpoints are limited to 6 requests per hour per IP:

• account/info
• account/mrc (client.account.recurring_charges())
• account/cdr (client.account.cdr())
• account/api-key (client.login())

The SDK automatically retries 429 responses with Retry-After honored, up to max_retries (default 2). To bump it:

Client(api_key=key, max_retries=4, timeout=60.0)

🛠️ Development

git clone https://github.com/voicetel/python-sdk
cd python-sdk
python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"

# Unit tests (fast, no network)
pytest tests/unit

# 100% coverage gate
pytest tests/unit --cov --cov-fail-under=100

# Lint + type-check
ruff check src tests
mypy src

# Integration tests (live api.voicetel.com, read-only)
cp .env.example .env  # fill in VOICETEL_USERNAME / VOICETEL_PASSWORD
pytest tests/integration

# Build wheel + sdist
python -m build
twine check dist/*

📖 API Documentation

• Reference docs: voicetel.com/docs/api/v2.2/
• Interactive playground: voicetel.com/docs/api/v2.2/playground/ — try the API in your browser without writing any code
• API credentials: voicetel.com/docs/api/v2.2/credentials/
• Type definitions: see the voicetel.models module — every wire shape has a Pydantic model.

🙌 Contributors

• Michael Mavroudis — Lead Developer

Contributions welcome. Open an issue describing the change you want to make, or send a pull request against main.

💖 Sponsors

Sponsor	Contribution
VoiceTel Communications	Primary development and production hosting

📄 License

This project is licensed under the MIT License — see the LICENSE file for details.