Now, let's discuss other tools that can help you monitor VoIP devices and calls.
Here is the Cisco Real‑Time Monitoring Tool,
RTMT. that helps you monitor the calls and overall Cisco
Unified Communication Infrastructure.
You can monitor the server's health, the virtual memory,
CPU, or hard disk usage to find out if everything is healthy.
You can also check any critical alerts.
If you want to see what's going on inside the Cisco
Unified Communication Manager Service, you can log into the Cisco RTMT tool,
and then under the System tab, go to Trace & Log Central,
and then click on Collect Files.
Here you can select the service for which you're interested in
capturing the trace and diagnostic logs.
And then select the service from which you want these traces from.
You can select Cisco CallManager service, if you want to see the
signaling part of Cisco CUCM server calls,
or if there is any issue related to audio quality or
media resources related issues,
you can capture the Cisco IP Voice Media Streaming App.
Or if something related to the Cisco TFTP server, you can
capture that too here. Check the relevant service your
issue is related to, for example,
Cisco Tomcat service or Cisco IM and Presence server related issues,
and then finally, very importantly,
you can select the timings in which the issue has occurred.
If you know the exact time, that is the best. Or if you want to
download the trace for a relative time range, like from last 5
minutes or 15‑30 minutes or so, you can do that as well.
You can also view the real‑time traffic from Real Time Trace, View
Real Time Data, then you can select the category, the service, and
the trace file types. In our case,
callogs. It's going to pull real time information when we make a call. Let's
go ahead and make a call again to extension 1002 and let's see what happens.
Here we see that the call has an INVITE message,
then we have the server Trying, and then 183 Session Progress,
which must be the announcement.
And then the call moves to 404 Not Found, just like we saw it in the
Wireshark Packet Tracer, so we know that what exactly has happened
from the server side too. I know it already that the extension 1002 is
not a valid or registered extension in my Cisco Unified Communication
Manager server here.
So the call was supposed to fail, but from this 404 Not Found message,
you have got the clue that there is something wrong with the destination
extension as it was not found in the system.
You can also check the Device Summary, like how many devices are
registered and on which server, how many gateways are registered,
how many media resources like conferencing,
transcoding,
or music on hold resources are available. This tool is a great place
to know the overall server's infrastructure health.
You can go to other tabs like Phone Summary, which will
give you a specific detail for registered phones, like
Skinny or SECP phone, or SIP phones.
You can also check the gateway‑related activity from the list of
supported gateway types, like an MGCP or HC23 gateway. And if you
want to check some real‑time data,
that is what's going on inside the servers, you can come to Real Time Data
and see some important things going on. There are so many important
options here in this tool that can help you monitor and troubleshoot Cisco
Unified Communication Infrastructure,
which is the largest on‑prem VoIP system today.
If you want to become a VoIP engineer,
you can see yourself on a call troubleshooting some important call issue in near future.