SIP Integration

Synthflow AI supports SIP (Session Initiation Protocol) integration for enterprise customers. This allows you to:

• Bring your own VoIP provider (e.g. Twilio, Telnyx)
• Use existing business phone numbers
• Integrate with internal PBX systems (e.g. 3CX, Asterisk)
• Maintain control over your call routing and infrastructure

This setup gives you full flexibility over your telephony stack while adding Synthflow’s conversational AI capabilities.

Integration Tiers

Synthflow classifies SIP provider integrations into tiers based on validation depth and ongoing support. Check which tier your provider falls into before starting setup.

Tier 1 — Native Integrations

Providers with a native, validated integration that Synthflow engineering actively tests and supports.

What this means for you:

• Integration is built and maintained by Synthflow engineering
• SIP header preservation, caller ID passthrough, and transfer flows are validated
• Documented with self-serve onboarding — standard setup timelines apply

Tier 2 — Community-Validated Integrations

Providers that have been successfully deployed or documented based on real customer engagements. Synthflow has implementation experience and guides, but does not actively regression-test these integrations.

What this means for you:

• Setup may require Professional Services involvement
• Timelines may vary — edge cases may surface that require engineering escalation
• Not actively regression-tested by Synthflow

Synthflow supports standard SIP trunking, so any other provider offering SIP connectivity may also work. Contact our team to discuss your setup.

Getting Started

To connect your phone numbers to Synthflow AI using SIP Trunking:

1. Create a SIP trunk with your VoIP provider.
2. Configure your phone numbers to route inbound calls through the trunk.
3. Point the SIP trunk to Synthflow’s SIP server.
4. Import your numbers into Synthflow and assign them to your agents.

This setup allows Synthflow to answer inbound calls and optionally transfer calls back to your PBX or a live agent.

PBX Integration (Optional)

If you already use an on-prem or cloud-based PBX (e.g. 3CX, FreePBX, Asterisk):

• You can configure a SIP trunk in your PBX to route specific calls to Synthflow AI.
• This lets you use AI agents alongside your internal call flows and extensions.