[asterisk-users] Outgoing PSTN calls , unusable voice quality

[Salvatore Giudice]

Take a packet capture of your VoIP segment and verify that the SDP is
correct and that the RTP is making it to the correct places. If all that
looks good and this is a straight out quality problem, then you need to
figure out if it's happening on the voip side or on the TDM side. You should
make calls (with captures) VoIP to Voip passing the media through your
asterisk and also try routing a tdm call in and back out. If you have the
equipment, take a mos score of the TDM loop.

Without any of the above, you will not be able to isolate the issue.

--------------------------------------------------
Salvatore Giudice
Salvatore.Giudice at VoIPSecurityTraining.com

VoIP Security Training, LLC
http://VoIPSecurityTraining.com

848 N. Rainbow Blvd. #1676
Las Vegas, NV 89107
Phone: (617) 959-7625
Fax: (214) 279-2906


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Veselin
Kantsev
Sent: Friday, November 30, 2007 2:47 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Outgoing PSTN calls , unusable voice quality

Hello,
I have an Asterisk running with a Sangoma A200 card with Hardware Echo 
cancelling connected to the UK PSTN.
If a PSTN call comes in, voice both ways is OK, however if an outgoing 
call over the PSTN is made I can hear the other party OK but they can 
not, they can barely understand what I am saying, my voice is unclear 
fading and skipping.
Internal SIP and IAX2 calls are OK, incoming/outgoing calls over IAX2 
are OK too. I've tried gsm/ulaw/alaw codecs so far.
Tried disabling the echo cancelling as well.

Any suggestions will be greatly appreciated.


Regards,
Veselin

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