> For a complete page index, fetch https://docs.synthflow.ai/llms.txt. For full documentation content, fetch https://docs.synthflow.ai/llms-full.txt.

# Telephony Integrations

> Telephony providers that connect to Synthflow over SIP, grouped by support tier, with a setup guide for each.

Synthflow connects to your existing carrier, PBX, or contact center over SIP, so agents answer and place calls on the numbers and call flows you already have. Choose your provider below. Each guide covers the provider's side of the setup and the number import in Synthflow.

Providers fall into two tiers, based on how deeply Synthflow tests and supports the integration. Check your provider's tier before you start.

## Tier 1 integrations \[#tier-1-native-integrations]

Tier 1 providers have a native integration that Synthflow engineering tests and supports. They are the lowest-risk starting point.

#### [Twilio](/twilio-sip-trunking)

Actively tested and supported

#### [Telnyx](/telnyx)

Actively tested and supported

#### [RingCentral (RingCX)](/ringcx)

Actively tested and supported

#### [Vonage](/vonage)

Actively tested and supported

#### [8x8](/8x8)

Actively tested and supported

#### [Zoom Phone](/zoom#zoom-phone-routing)

Actively tested and supported

#### [Zoom Contact Centre](/zoom#zoom-contact-centre-routing)

Actively tested and supported

#### [Five9](/five9)

Actively tested and supported

#### [Freshcaller](/freshworks)

Set up through the Freshworks integration

Synthflow engineering builds and maintains these integrations. SIP header preservation, caller ID passthrough, and transfer flows are validated, and each has standard onboarding guidance and setup timelines.

## Tier 2 integrations \[#tier-2-community-validated-integrations]

Tier 2 providers have been deployed with real customers, and Synthflow has guides for them, but does not regression-test them.

#### [Dialpad](/dialpad)

Integration guide available

#### [3CX](/3cx)

Integration guide available

#### [Aircall](/aircall)

Integration guide available

#### [Genesys Cloud](/genesys-cloud)

Integration guide available

#### [Asterisk](/asterisk)

Integration guide available

#### [Talkdesk](/talkdesk)

Integration guide available

Expect more variation between deployments than with Tier 1. Setup can need Professional Services, and timelines vary when an edge case needs engineering escalation.

## Other SIP providers

Synthflow supports standard SIP trunking, so other carriers and PBXs with SIP connectivity can also connect. [Connect over SIP](/connect-over-sip) covers the SIP addresses, trunk settings, number import, and encryption. Contact our team to discuss your setup.