# Avaya IP Office

## How Voice Logica connects

IP Office **registers a SIP Line to Voice Logica** ([way 1](https://docs.voicelogica.ai/phone-systems/#the-four-ways-voice-logica-connects)). Voice Logica creates the trunk and gives you a server, a username and a password.

- Calls IP Office sends out on this line group are answered by the AI agent.
- The agent transfers callers back over the same line; an **Incoming Call Route** rings the extension.

## Before you start

- **SIP Trunk Channels** licences for the simultaneous calls (**License → SIP Trunk Channels**). A Warm transfer uses two until it connects.
- **Manager** at the same version as the IP Office software.

## 1. Create the connection in Voice Logica

**Telephony - Trunks - Connect your PBX**, pick **Avaya IP Office** and the agent. Keep the dialog open until it says **Connected**.

## 2. Add the SIP Line in Manager

1. Right-click **Line → New → SIP Line**. Note its **Line Group ID**.
2. **SIP Line** tab: **ITSP Domain Name** = the server.
3. **Transport** tab: **ITSP Proxy Address** = the server, **Layer 4 Protocol** UDP, **Send Port** 5060.
4. **SIP Credentials**: add **User name** and **Authentication Name** = the username, **Password** = the password, **Expiry** 60 minutes, **Registration required** ticked.
5. **VoIP** tab: **Codec Selection** G.711 A-law first; **DTMF Support** = RFC2833.
6. Merge and save the configuration.

## 3. Send calls to the agent

A **short code** or **ARS** entry that dials out on this Line Group ID. Point an auto-attendant option, a hunt group overflow or an after-hours route at it.

## 4. Let the agent transfer back to extensions

An **Incoming Call Route** for this Line Group ID, with the extensions as destination (or by incoming number). Then, in Voice Logica, add the extensions as transfer destinations: an **External** destination with the extension number, or a **User** with that extension. Use **Warm** transfer.

## 5. Check it works

- The dialog says **Connected**; **System Status → Trunks** on IP Office shows the line in service.
- Dial the short code from an extension: the call appears in **Calls**.