asterisk users - Jun 2013 - Troubleshooting TDMs (Packet capture like debugging)

Hi All,

I am looking for a way to troubleshoot issues with TDM (E1) trunks
with a provider.

Currently with SIP trunks I am using tcpdump to perform packet
captures between our gateways and the SIP providers IPs, capturing
traffic on all ports, to include both the SIP messages and the RTP
stream.

How can I achieve a similar result on TDM links connected to TDM cards
in Asterisk servers, where by I can see the signalling (like the SIP
message) and the audio stream (like the RTP stream) in my packet
captures?

If it helps, the end goal is to create something like the packet
captures I am making so I can see the control signals and audio
streams (in and out) for troubleshooting one way audio issues for
example. So, am I sending audio to the TDM provider, are they sending
it to me, have we both signalled correctly to start/stop sending
audio, etc.

Many thanks,
James.

On Thu, Jun 13, 2013 at 9:23 AM, James Bensley <jwbensley at gmail.com>
wrote:
> Hi All,
>
> I am looking for a way to troubleshoot issues with TDM (E1) trunks
> with a provider.
>
> Currently with SIP trunks I am using tcpdump to perform packet
> captures between our gateways and the SIP providers IPs, capturing
> traffic on all ports, to include both the SIP messages and the RTP
> stream.
>
> How can I achieve a similar result on TDM links connected to TDM cards
> in Asterisk servers, where by I can see the signalling (like the SIP
> message) and the audio stream (like the RTP stream) in my packet
> captures?
>
> If it helps, the end goal is to create something like the packet
> captures I am making so I can see the control signals and audio
> streams (in and out) for troubleshooting one way audio issues for
> example. So, am I sending audio to the TDM provider, are they sending
> it to me, have we both signalled correctly to start/stop sending
> audio, etc.
>
> Many thanks,
> James.
>
>
Is it PRI?  You can see PRI debug info on the console.  Extremely valuable
in troubleshooting.   http://www.voip-info.org/wiki/view/Asterisk+CLI

Zap channel commands

zap destroy channel: Destroy a channel
zap show channels: Show active zapata channels
zap show channel: Show information on a channel
zap show status: lists all the Zaptel spans. A span will apear here whether
or not its channels are configured with chan_zap.
zap show cadences: Show the configured ring cadences (available e.g with
Zap/1r2).
zap set swgain(<= 1.6): set the (software) gain for a hannel. Temporary
equivalents of rxgain and txgain in zapata.conf.
zap set hwgain(<=1.6): set the hardware gain for channels that support it.
zap set dnd(<=1.6) set a channel's do-not-disturb mode on or off.


The following commands are available if the channel is built with support
for libpri:

pri debug span: Enables PRI debugging on a span
pri intense debug span: Enables REALLY INTENSE PRI debugging
pri no debug span: Disables PRI debugging on a span
pri show spans: List spans and their status.
pri show span: Information about a span.
pri show debug: show where debug is enabled.
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Hi!

Depending which TDM board you are using there might already be tool to 
get a pcap trace. E.g. if you have a Sangoma board, the wanpipemon 
utility has a -pcap option. I don't know about other boards. Wireshark 
already comes with basic support for ISDN protocols, so now work is 
needed here.

jg

In article <CAAWx_pVGZA965LjXWRNA_tKz2HkhqubOknGeSsSjE3bKkVE8-A at
mail.gmail.com>,
James Bensley <jwbensley at gmail.com> wrote:
> Hi All,
> 
> I am looking for a way to troubleshoot issues with TDM (E1) trunks
> with a provider.
> 
> Currently with SIP trunks I am using tcpdump to perform packet
> captures between our gateways and the SIP providers IPs, capturing
> traffic on all ports, to include both the SIP messages and the RTP
> stream.
> 
> How can I achieve a similar result on TDM links connected to TDM cards
> in Asterisk servers, where by I can see the signalling (like the SIP
> message) and the audio stream (like the RTP stream) in my packet
> captures?
> 
> If it helps, the end goal is to create something like the packet
> captures I am making so I can see the control signals and audio
> streams (in and out) for troubleshooting one way audio issues for
> example. So, am I sending audio to the TDM provider, are they sending
> it to me, have we both signalled correctly to start/stop sending
> audio, etc.
A google for "DAHDI pcap" led me to the following page:
http://forums.digium.com/viewtopic.php?f=1&t=82833

That suggests that DAHDI 2.6 onwards can be compiled with pcap support,
that presumably provides the drivers with the ability to capture to
pcap files, and a tool to control it.

Presumably a recent version of Wiresharl will then be able to interpret
the captured files.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org