[asterisk-users] "clicking" sound with alaw codec

[Danny Nicholas]

Your sounds might be too loud.  We use a lot of custom sounds here and when
the volume approaches 0 db (asterisk standard is -3 db) we get fuzz and
clicks.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Richard Kenner
Sent: Thursday, January 24, 2013 2:45 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] "clicking" sound with alaw codec

I'm trying to interface Asterisk with an Alcatel PABX and trying to find a
code that works well.  It says it doesn't support ulaw, though it doesn't
reject it.  It supports G.729, and that works fine, but we'd prefer not to
use compression.

When I use alaw, the path from Asterisk to the Alcatel is completely clean,
but the other way has a set of clicks that kind of sound like old-fashioned
audio noise.

The outgoing SDP looks like this:

v=0
o=root 1691755711 1691755711 IN IP4 205.232.38.178 s=Asterisk PBX 10.7.1
c=IN IP4 205.232.38.178
t=0 0
m=audio 11432 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv

The reply SDP is:

v=0
o=default 1359060187 1359060187 IN IP4 10.10.22.246 s=Asterisk PBX 10.7.1
c=IN IP4 10.10.22.246
t=0 0
m=audio 32000 RTP/AVP 8 101
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=maxptime:90

Any suggestions on how to debug what's causing this?

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