Solved

Asterisk MoH Sound Quality

Posted on 2008-06-19
8
1,367 Views
Last Modified: 2013-11-12
Every time I convert either a WAV or MP3 file to GSM using sox the sound quality drops drastically.  I have even tried to convert the file to GSM using an audio converter but stil no luck. Our PBX is asterisk v1.2 based.  Any suggestions on how to make Music on Hold not sound like it is distorted?  Thanks in advance.
0
Comment
Question by:sharpC
  • 4
  • 3
8 Comments
 
LVL 36

Expert Comment

by:grblades
ID: 21829089
If you playback the converted file on a pc does it sound correct?

Have you tried reducing the volume during the conversion process?
Normally on hold music is quieter than voice so it is normal to reduce the volume.
0
 

Author Comment

by:sharpC
ID: 21830954
On my pc recording sounds great.  And yes, I have tried reducing the volume.  In addition, I have tried saving it to various file formats using Adobe Audtion but still sounds like my sound clip has become synthesized.  Any other suggestions?
0
 
LVL 36

Expert Comment

by:grblades
ID: 21831222
gsm is a compressed format so it wont sound perfect. Certenly if you are listening to it on a pc it will be a vast difference in quality. Using a telephone handset it should be less noticeable though.

Maybe gsm is not the best format. Over what sort of connection are people going to be hearing the music on hold?
0
Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

 

Author Comment

by:sharpC
ID: 21832546
I "think" you are asking me about my PBX.  We use an asterisk v1.2 server connected through a T1. Sorry if I am being dense.
0
 
LVL 36

Expert Comment

by:grblades
ID: 21832748
Is the T1 offering a primary rate telephone service or are you using voip over it?
If you are using voip do you know what codec you are using? (ulaw/alaw (g711), gsm, g723 etc...)
0
 

Author Comment

by:sharpC
ID: 21856823
I had to verify settings with our vendors.  T1 is VoIP and our PBX is using:     G711 codec to transmit audio.  In the case of remote users where the Low Bandwidth Codec option is checked, the pbx will use the G729 codec
0
 
LVL 36

Accepted Solution

by:
grblades earned 125 total points
ID: 21858034
In that case I would not convert it to gsm format. You are just converting to a lower quality more compressed format which asterisk will have to decompress to g711 or decompress and recompress back into g729.

You would be best off converting to .sln format (which us basically g711) using the instructions at :-
http://www.voip-info.org/tiki-index.php?page=Convert+WAV+audio+files+for+use+in+Asterisk
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Cisco ISR - SIP and CUBE - CUCM 10 5 70
Analog Phone 2 86
Send email from application via gmail 4 77
Cisco CUCM 10.5: password recovery 2 104
The point of this post is to give you a copy/paste installation solution to setting up Asterisk 1.6 on Ubuntu 9.04 (or similar) server. # Setup the system apt-get install subversion apt-get install make apt-get install linux-source kernel-p…
Implementing Avaya's One-X portal is pretty painless, until you want to deploy this to the Android and iPhone clients when these clients are outside of your network. The clients will also work within your local network. Here is our experience and so…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question