# Unique background music for the queue The function can be useful if there is a need to play an advertising audio file instead of background music. You can assign your own file to each queue. 1. Go to the section "**Telephony**" -> "**Sound files**" -> "**Music on hold**"

2. Add media files:

3. After saving the media file, copy its ID from the browser address bar. For example , in a link like "" the identifier is the number **5**.

4. Go to the "**System**" -> "**System file customization**"

5. Open the file "**/etc/asterisk/extensions.conf**" for editing

6. Paste the following code at the end of the file: ```php [queue-pre-dial-custom] exten => 2001,1,Set(CHANNEL(musicclass)=moh-5) exten => 2002,1,Set(CHANNEL(musicclass)=moh-6) exten => _X!,2,return ```

{% hint style="success" %} According to this example, for the queue with the number "**2001**", a file with the ID **5** will be played in the background, for the queue "**2002**", a file with the ID **6** {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.mikopbx.com/mikopbx/english/faq/cases/unique-background-music-for-the-queue.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.