[asterisk-users] MOH distorted voice in Native and MP3 format

[Steve Davies]

On 21 July 2010 10:59, MohammedShehzad <pmhshz at gmail.com> wrote:
>> > I have been facing an issue that voice is getting distorted sometimes in MOH
>> > (MusicOnHold) application.
>> > I have checked and confirmed that lame is properly installed, even tried
>> > native formats (ulaw, alaw, gsm), but the randomly seen distortion in MOH
>> > can't be eliminated.
>> > I came to know about requirement of timing device for MOH and MeetMe and a
>> > very good illustration by Andrew Kohlsmith on below old post.
>> > http://www.mail-archive.com/aster...@uc.org/msg01449.html
>>
>> This post is over 4 years old. Things have since changed.
>>
>> There's no requirement for MoH to be in mp3 format. Generally just use
>> sound files Asterisk can play.
>
> Thanks Tzafrir, You are correct the post is very old.
> It is also correct that there is no requirement for MoH to be in MP3
> format, that is why I already replaced all MP3s with native formats
> (ULAW, ALAW, GSM etc).
> But even though the distortion is heard sometimes it is terrible and
> making leaving the call unprofessional. That make me think and suspect
> for timing related issues which seemed earlier.
> The sound files plays music and voice in-between at some interval, is
> there any issue of having music and voice same time in MoH?

You do not give any details of who/where the caller is that is
listening to the corrupted MOH audio.

Have you tried with a local SIP phone to see if it is a corruption
locally or in the onward transit (whatever that may be) - For example,
GSM phones will often distort music as the codec is designed for
speech. This is largely unavoidable.

Regards,
Steve