> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sondos-ai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Phone System Integrations

> Learn how to integrate sondos-ai.com with your existing PBX or VOIP infrastructure through SIP trunks

For businesses with existing PBX or VOIP infrastructure, sondos-ai.com can integrate through SIP trunks or direct connections:

## 1. SIP Trunk

* **How It Works**: You share your SIP credentials (server, username, password). sondos-ai.com configures a trunk internally.
* **Inbound/Outbound**: AI can pick up inbound calls from your PBX or place outbound calls using your existing number ranges.

## 2. Caller ID Forwarding

* If your PBX already handles call routing, pass the call to sondos-ai.com only when certain conditions are met (like after IVR selection).

## 3. Hybrid Model

* Some advanced setups keep human agents on your PBX but leverage the AI for high-volume or after-hours calls.
* Example: *During business hours, normal agents handle calls. After hours, calls route to the AI assistant via SIP trunk.*

## 4. Things to Note

* SIP sometimes requires opening firewall ports or whitelisting IPs.
* Carrier charges from your PBX provider still apply, plus any sondos-ai.com usage fees.

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**Tip:** Contact support for guidance if you're new to SIP or PBX integration. We can assist with the config steps.