Debugging Voice Data - Patton electronics SmartWare R.3.20 Software Configuration Manual

SmartWare Software Configuration Guide

Debugging voice data

There are several debug monitors that can help identify problems in VoIP connections. The most common
VoIP problems are: voice quality problems (dropouts), fax transmission errors, no establishment of voice con-
nection, and wrong tone or playback.
An overview of all available VoIP debug monitors is given below. Some more specific examples for debugging
cases follow after that.
Overview: VoIP and DSP debug monitors
debug voip dejitter
debug voip events
debug voip rtp
debug voip t38 events
debug voip t38 dejitter
debug voip demux
debug voip cs
debug dsp events
debug dsp errors
Debugging voice data
Displays changes to the settings of the dejitter buffer, exceptions (under-
run, overrun, packet drops) and size changes.
Usage: To investigate problems related to voice quality, voice packet
payload sizes, delays, jitter
Displays control activities on the Data Path (path of voice/fax data
packets within your unit): State changes, tone start/stop, DTMF play-
back/detection, fax/modem detection.
Usage: To investigate problems with voice connections, DTMF, tone
playback, fax and modem transmissions.
Displays RTP related call parameters at call setup: local/remote IP
address and port, SSRC. During operation, displays periodically
updated statistics containing the number of sent and received packets,
the number of lost packets.
Usage: To verify that RTP packets are sent/received, and to debug net-
work quality issues (lost packets).
Displays T.38 related call parameters at call setup, and operational
errors like lost packets.
Usage: To investigate problems with T.38 Fax transmissions in general
Tracks the operation of a special dejitter buffer used for T.38 Fax trans-
missions.
Usage: To document the influence of network quality on T.38 Fax trans-
missions.
Displays changes to the "context demultiplexer".
Usage: To identify problems when no voice connection can be estab-
lished.
Displays control activities on the TDM part of the Data Path: DSP
resource allocation, TDM timeslot switching, hair pinning).
Usage: To investigate problems with hair pinning or timeslot switching.
Displays control activities on the DSP including all call parameters (e.g.
the used codec).
Usage: To document the DSP parameters used for each call setup.
Displays DSP errors (e.g. configuration errors, DSP software crashes,
under/overruns).
Usage: To investigate in all kind of problems that involve a DSP (voice
connections, fax, tones, ...)
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