Patton electronic SmartNode 4110 Series Way rtp, Way switch, Way dsp, Way fax-data, Way error

SmartWare Software Configuration Guide52 • VoIP debugging

[no] debug media-gate-	Displays RTP related call parameters at call setup: local/remote IP
way rtp	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).
[no] debug media-gate-	Displays control activities on the TDM part of the Data Path.
way switch	Usage: To investigate problems with hair pinning or timeslot switching.
[no] debug media-gate-	Displays control activities on the DSP including all call parameters (e.g.
way dsp	the used codec).
	Usage: To document the DSP parameters used for each call setup.
[no] debug media-gate-	Traces detected Modem and Fax tones.
way fax-data	Traces the flow of T.30 communication states between the fax machines.
	Decodes the IFP (Internet Fax Protocol) elements within T.38 packets.
	Displays T.38 related call parameters and operational errors like lost
	packets.
	Tracks the operation of the dejitter buffer used for T.38 Fax transmis-
	sions.
	Usage: To investigate problems with T.38 Fax and Modem transmissions in
	general.
[no] debug media-gate-	Displays detected errors over all the different parts of the Media Gate-
way error	way.
[no] debug media-gate-	Enables/Disables all Media Gateway monitors
way all

Depending on the type of problem, some debug monitors are more useful than others. Try to avoid enabling all monitors at the same time, as this generates a lot of output and can degrade system performance. The follow- ing examples show some typical debug cases and what monitors should be switched on in these cases.

Example: Debugging voice connections

Symptoms: Voice quality is bad (dropouts), the voice connection is only established in one direction or not at all, there is only noise instead of voice, no tones are played (e.g. dialtone).

Prerequisite: The call is established from a signaling point of view (see chapters Debug H.323 Data and Debug Session Control Data).

Use the following debug monitors:

Step	Command	Purpose
1	unit#debug media-gateway rtp	Enable the RTP/RTCP debug moni-
		tor
2	unit#debug media-gateway dejitter	Enable the dejitter buffer monitor.

Example: Debugging Fax connections

Symptoms: Fax transmission starts but is interrupted and the Fax machines terminate with an error message, Fax transmission does not start at all, the unit’s firmware does not detect Fax.

Debugging voice data 641