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

[Veselin Kantsev]

Thank you much for the prompt reply Salvatore.

Would you have the time to explain further how should I go for verifying
that SDP and RTP are OK.
Also what is reffered to as the TDM site.

Veselin

On Fri, Nov 30, 2007 at 05:01:17PM -0500, Salvatore Giudice wrote:
> 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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