![background image](http://html1.mh-extra.com/html/patton-electronics/smartware-r-3-20/smartware-r-3-20_software-configuration-manual_4044387549.webp)
Debugging voice data
549
SmartWare Software Configuration Guide
42 • VoIP debugging
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
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
debug voip events
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.
debug voip rtp
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).
debug voip t38 events
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
debug voip t38 dejitter
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.
debug voip demux
Displays changes to the “context demultiplexer”.
Usage: To identify problems when no voice connection can be estab-
lished.
debug voip cs
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.
debug dsp events
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.
debug dsp errors
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, …)