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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.

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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

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Compatible Platforms

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

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Contact Centers

PlatformDetails
NiCE CXoneSIP backchannel via Studio scripts. Inbound routing, outbound campaigns via Personal Connection, live agent escalation via Signal API.
Cisco CUCM / UCCXSIP trunk peering with route patterns and CTI route points. Call queuing and agent handoff.
Five9Conversation handoff and external call recording ingestion.
GenesysSIP-based call routing and agent handoff.
Any other SIP-compatible CCaaS platform will work the same way.

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PBX Systems

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

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Carriers

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

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Outbound Calls

Simple AI places calls through your SIP trunk. The AI agent is on the line from the moment the customer picks up.
  1. Create a call via the API with a phone number that’s on your SIP trunk
  2. Simple AI sends the SIP INVITE to your carrier
  3. Your carrier dials the customer with your branded number
  4. 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.

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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.

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Contact Center Flows

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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.

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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.

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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.

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Connection Details

SettingValue
TransportTCP or TLS (TLS recommended)
Audio CodecsG.711 u-law (PCMU), G.711 A-law (PCMA), Opus
DTMFRFC 2833
Number FormatE.164
AuthIP-based allowlisting or SIP digest (RFC 3261)
Custom HeadersX- prefixed headers for passing metadata (call IDs, CRM context)
Contact your account team for your dedicated SIP endpoint and credentials.

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Setup

  1. Share your SIP details — carrier endpoint, auth credentials or IPs, and phone numbers (E.164)
  2. We configure the trunk — connection, auth, number routing, codec preferences
  3. You configure your carrier — allowlist our IPs (outbound) or point your routing to our endpoint (inbound)
  4. 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.

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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).