---
title: Why Do Calls Fail When Using Multiple Tabs in FreJun? | SIP Conflict FAQ
description: Calls fail when using multiple tabs because different tokens or softphone instances cause SIP conflicts; to avoid this, use only one active tab at a time.
---

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# Why Do Calls Fail When Using Multiple Tabs in FreJun? | SIP Conflict FAQ

## In FreJun, calls can fail when multiple browser tabs are open with different authentication tokens or softphone instances, as this creates SIP (Session Initiation Protocol) conflicts on the backend. To prevent call failures, it is recommended to limit usage to a single active tab where the softphone is initialized and calls are placed.

Using multiple tabs with different tokens or softphone instances can cause SIP conflicts. Limit usage to a single active tab.

 

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