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oza.4h07 at gmail.com
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 Posted: Wed May 18, 2016 9:44 am Post subject: [asterisk-users] Advices on how to evaluate voice quality in |
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Hello,
I've got the following setup:
PSTN ---- ITSP ---- SDSL Modem-Router --<SIP ?>-- Gateway --<BRI>--- Asterisk with B410P --- SIP Phones
Both SDSL Modem-Router and Gateway are managed by my ITSP.
Some calls coming from PSTN and forwarded to an other PSTN number have a poor voice quality.
How can I best illustrate this ?
A friend advised me to simply record incoming DAHDI channel, for instance.
How can I then translate record WAV file into meaningful figures ?
More generaly, what would you suggest ?
Regards |
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creslin at digium.com
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| Posted: Thu May 26, 2016 9:53 am Post subject: [asterisk-users] Advices on how to evaluate voice quality in |
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On Wed, May 18, 2016 at 9:44 AM, Olivier <oza.4h07@gmail.com> wrote:
| Quote: | I've got the following setup:
PSTN ---- ITSP ---- SDSL Modem-Router --<SIP ?>-- Gateway --<BRI>---
Asterisk with B410P --- SIP Phones
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Wow.
| Quote: | Both SDSL Modem-Router and Gateway are managed by my ITSP.
Some calls coming from PSTN and forwarded to an other PSTN number have a
poor voice quality.
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How are you forwarding them? Is it in such a way that you remain in
the audio path, or do you get out of the audio path in the forward?
| Quote: | How can I best illustrate this ?
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It depends on what let has the bad audio. If it's on the SIP side
(RTP to RTP) a pcap file will show you your perspective of audio
losses. Received RTCP reports should show you the other side's
perspective of audio losses as well.
| Quote: | A friend advised me to simply record incoming DAHDI channel, for instance.
How can I then translate record WAV file into meaningful figures ?
|
If DAHDI is still in the picture in the forward scenario, that would
be another place to monitor the audio.
| Quote: | More generaly, what would you suggest ?
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Try to capture each leg (IP side, using tcpdump/wireshark) and on
DAHDI using dahdi_monitor or something equivalent. Figure out if any
of your legs of audio quality issues. If you don't see anything, it's
something at their end.
--
Matthew Fredrickson
Digium, Inc. | Engineering Manager
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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