SIP Integration

If your organization already has a carrier, phone numbers, or a contact center platform, you can connect Simple AI directly to your existing infrastructure via SIP. Simple AI will send and receive calls through your systems instead of its default telephony — keeping your branded caller ID, compliance setup, and reporting in place.

What You Can Do

Route outbound AI calls through your carrier with your caller ID
Forward inbound calls from your phone system or contact center to Simple AI
Transfer calls between Simple AI and live agents on your platform
Use your existing phone numbers without porting

Compatible Platforms

Simple AI connects via standard SIP trunks. If your system supports SIP, it works.

Contact Centers

Platform	Details
NiCE CXone	SIP backchannel via Studio scripts. Inbound routing, outbound campaigns via Personal Connection, live agent escalation via Signal API.
Cisco CUCM / UCCX	SIP trunk peering with route patterns and CTI route points. Call queuing and agent handoff.
Five9	Conversation handoff and external call recording ingestion.
Genesys	SIP-based call routing and agent handoff.
Talkdesk	BYOC SIP trunk with Studio routing and agent handoff.
RingCentral	Cloud Connect or SIP peering with queue-based handoff.
8x8	SIP trunk with 8x8 Contact Center routing and agent handoff.
Amazon Connect	Contact flow transfer, or SIP via a Chime SDK Voice Connector.
Avaya	SIP trunk from Session Manager or Experience Portal, with VDN and skill handoff.
Twilio Flex	Elastic SIP Trunk or TaskRouter-driven transfer.
Dialpad	SIP trunk with Dialpad Ai Contact Center routing.
Zoom Contact Center	SIP trunk with Zoom flow routing and agent handoff.

Any other SIP-compatible CCaaS platform will work the same way. Per-platform setup details live in CCaaS Integrations.

PBX Systems

Cisco CUCM, Asterisk / FreePBX, 3CX, Avaya, Microsoft Teams (via SBC), or any SIP-compliant PBX.

Carriers

Any SIP trunk provider — Twilio, Vonage, Bandwidth, Telnyx, or your own. Simple AI is carrier-agnostic.

Outbound Calls

Simple AI places calls through your SIP trunk. The AI agent is on the line from the moment the customer picks up.

Create a call via the API with a phone number that’s on your SIP trunk
Simple AI sends the SIP INVITE to your carrier
Your carrier dials the customer with your branded number
Customer answers, conversation starts immediately

curl -X POST https://api.usesimple.ai/v2/calls \
  -H "Authorization: Bearer <your-api-key>" \
  -H "Content-Type: application/json" \
  -d '{
    "agent_id": "your-agent-uuid",
    "to_number": "+15551234567",
    "from_number": "+15559876543"
  }'

Use a from_number that’s configured on your SIP trunk. Simple AI routes through the correct trunk automatically.

Inbound Calls

Your carrier or contact center forwards calls to Simple AI’s SIP endpoint. Simple AI picks up, runs the AI conversation, and can transfer to a live agent when needed.

Customer → Your Carrier → Contact Center (optional) → Simple AI

The contact center controls routing — it decides when a call goes to the AI vs. a human. Simple AI can hand the call back for live agent escalation at any point.

Contact Center Flows

Inbound Through a Contact Center

Your contact center receives the call, runs IVR and routing, then SIP-transfers to Simple AI when the AI should handle it. Simple AI can transfer back for live agent escalation.

Outbound Campaigns

Your contact center’s dialer handles pacing, DNC compliance, and answering machine detection. Connected calls get SIP-transferred to Simple AI for the conversation. Use this for bulk outreach where the contact center manages the campaign.

Direct Outbound

For single calls (API-triggered, CRM callbacks), go direct through your carrier’s SIP trunk. No contact center in the middle. This is the fastest path — zero transfer delay.

Connection Details

Setting	Value
Transport	TCP or TLS (TLS recommended)
Audio Codecs	G.711 u-law (PCMU), G.711 A-law (PCMA), Opus
DTMF	RFC 2833
Number Format	E.164
Auth	IP-based allowlisting or SIP digest (RFC 3261)
Custom Headers	`X-` prefixed headers for passing metadata (call IDs, CRM context)

Contact your account team for your dedicated SIP endpoint and credentials.

Setup

Share your SIP details — carrier endpoint, auth credentials or IPs, and phone numbers (E.164)
We configure the trunk — connection, auth, number routing, codec preferences
You configure your carrier — allowlist our IPs (outbound) or point your routing to our endpoint (inbound)
Test — place a test call in each direction to verify caller ID, audio, and transfers

Your account team handles the setup. Reach out at support@usesimple.ai to get started.

FAQ

Do I need to port my numbers? No. Your numbers stay with your carrier. Simple AI routes calls through your SIP trunk. Can I mix SIP and default telephony? Yes. Numbers on a SIP trunk route through your carrier. Everything else uses Simple AI’s default telephony. Is there additional cost? SIP integration is available on Enterprise plans. Contact your account team. Does call recording still work? Yes. Recording works the same regardless of how the call is routed. Can the AI transfer to a live agent? Yes — blind transfer or attended transfer to any SIP destination (agents, queues, IVR, external numbers).

Get Started

Core Concepts

Channels

Campaigns

Journeys

Post-Call Intelligence

Agent Capabilities

Integrations

CCaaS Integrations

SDK

Help Center

What You Can Do

Compatible Platforms

Contact Centers

PBX Systems

Carriers

Outbound Calls

Inbound Calls

Contact Center Flows

Inbound Through a Contact Center

Outbound Campaigns

Direct Outbound

Connection Details

Setup

FAQ

​What You Can Do

​Compatible Platforms

​Contact Centers

​PBX Systems

​Carriers

​Outbound Calls

​Inbound Calls

​Contact Center Flows

​Inbound Through a Contact Center

​Outbound Campaigns

​Direct Outbound

​Connection Details

​Setup

​FAQ

What You Can Do

Compatible Platforms

Contact Centers

PBX Systems

Carriers

Outbound Calls

Inbound Calls

Contact Center Flows

Inbound Through a Contact Center

Outbound Campaigns

Direct Outbound

Connection Details

Setup

FAQ