It’s a good time to work / collaborate remotely without traveling, or video chat with your loved ones to prevent the spread of the world-threatening Coronavirus (COVID-19). You can do this with the video conferencing server that I have presented to everyone in the link below.
You do not need to register or enter any user information. You can easily create a video call room by clicking the link below:
After creating and joining a video call room, you can select and copy the page URL in your browser and share it with other participants so they can join the same room. 🙂
Note: This page works best with Chrome / Chromium and Opera.
The Call Detail Records (CDR) and Call Measurement Records (CMR, also referred as “Call Diagnostics Records”) offer details for each phone call passing by the Cisco Unified Communications Manager (CUCM). In CUCM CDR CMR records are disabled by default, so that you have to enable them manually.
You can enable CDR and CMR in CUCM by following steps below:
How to Enable Call Detail Record (CDR) on CUCM:
Login to administration page on Publisher CUCM. Click System -> Service Parameters menu.
2. Then select your server which has callmanager service enabled and then select Cisco CallManager (Active)
3. On System section find CDR Enabled Flag Parameter and set to True. If you’d like to see calls with zero duration, find CDR Log Calls with Zero Duration Flag (just below the CDR Enabled Flag)and set to True.
4. Do this for each CUCM Server if you have more than one server that has Callmanager service enabled.
How to Enable Call Measurement (CMR) on CUCM:
On the same Service Parameter menu, go up and click Advanced.
2. Find the Clusterwide Parameters section, and change Call Diagnostics Enabled Parameter from Disabled to which option you wish.
Note: Since CMR parameter is in Clusterwide Parameters, you don’t need to enable this on each server.
While dealing with Cisco Meeting Server (CMS), you may encounter many errors such as audio / video packet loss, signaling problems, and you may need to listen to network traffic from time to time to fix them. In this article, you can find steps to get Wireshark Packet Capture in Cisco Meeting Server (CMS).
CMS Wireshark Packet Capture Steps:
First, connect to your CMS server via SSH to access the CMS MMP interface.
In some installations, CMS may have more than one network interface. So, after connecting, use the callbridge command to find out which interface to capture from:
Find Interface Using “callbridge” Command
To start the packet capture process, use the pcap command (in our example we will use the pcap a command):
Starting Packet Capture with “pcap a” Command
Once you start the Packet Capture process, re-create the traffic you want to listen to, and then use the Ctrl + C key combination to finish the capture process.
Note: The size of the .pcap file can be up to 100MB.
You can use an SCP program to download the generated .pcap file (in our example we will use WinSCP). Connect to the CMS using the username and password that you SSH connection with the SCP program, and find the corresponding .pcap file, and then download it to your computer:
Cisco multi-port voice gateways have one or more ports for analog phones which is called RJ-21. Since the distance between the Cisco voice gateway and the phone distribution frame can be variable, you may need to make a special cable to connect these ports.
You can see the RJ-21 port and pin order used in Cisco multi-port analog voice gateways in the following image:
Cisco RJ-21 Connector Pinout
In the table below, you can find the pin sequence of RJ-21 ports used in Cisco multi-port analog voice gateways:
The command interface commands of Cisco and Huawei network devices, -which are the two most used vendors in the networking world-, are different from each other. In the table below you can find the equivalents of the basic router commands from two different vendors:
Cisco – Huawei Command Mapping Table:
Cisco
Huawei
ping
ping
traceroute
tracert
show
display
show interfaces
display interface
show ip route
display routing-table
show ip interface
display ip interface
show version
display version
show ip bgp
display bgp routing-table
show clock
display clock
show port
display port-mapping
show flash
dir flash: (user view modunda)
show logging
display logbuffer
show snmp
display snmp-agent statistics
show frame-relay pvc
display fr pvc-info
show users
display users
enable
super
disable
super 0
conf t
system-view
exit
quit
end
return
show policy-map interface
display qos policy interface
send
send (user view modunda)
write terminal (sh run)
display current-configuration
sh startup
display saved-configuration
write erase
reset saved-configuration
write mem (wr / copy run start)
save
clear counters
reset counters interface
telnet
telnet
enable secret (conf modunda)
super pass cipher (system modunda)
term mon
term debu
clock
clock
no
undo
debug / no debug
debugging / undo debugging
copy running-config
save safely
terminal monitor
terminal monitor
terminal no monitor
undo terminal monitor
clear counters
reset counters interface
clear interface
reset counters interface
clear access-list counters
reset acl counter all
reload
reboot
shutdown
shutdown
boot
boot bootrom
aaa
hwtacacs scheme
terminal no monitor
undo terminal monitor
tacacs-server
hwtacacs scheme
snmp-server
tftp-server
router bgp
bgp
router rip
rip
clear ip cef
reset ip fast-forwarding
clear ip route *
reset ip routing-table statistics protocol all
clear ip bgp
reset bgp all
show tech
display diagnostic-information
sh ip nat translation
display nat session
show controller
display controller
show dsl int atm 0
display dsl status interface atm 2/0
sho atm pvc
display atm pvc-info
sho crypto isakmp sa
display ike sa
sho crypto isakmp key
display ike peer
sho crypto isakmp police
display ike proposal
Cisco – Huawei Commands
Google Meet and Noise Canceling Solution with Artificial Intelligence
Because of the pandemic period, you know that web video conferencing systems have become very popular with working from home. Although Zoom is dominating the market, Google is also one of those who want to increase it’s market share. It aims to add new features to its platform day by day. Thanks to noise canceling feature recently added to Google Meet, Google seems to have made an innovation in this area.
In April 2020, Google announced that Meet’s noise canceling feature is available for G Suite Enterprise and G Suite Enterprise for Education. We should also point out that the father of the idea of this feature is G Suite Product Management Director Serge Lachapelle. Serge Lachapelle has worked on video conferencing technologies for 25 years, (13 of which are on Google) and he is quite experienced.
Beginning of the Project
Basically, this project starts with acquisition of Limes Audio in January 2017. The main idea arises from the difficulties experienced in the meetings held with the participants in different time zones (sounds of children and pets of home workers, breakfast sounds, etc.).
How to Prevent Noise in Google Meet?
Maybe there are those who use it, some headphones and smartphones have noise canceling mechanisms that use multiple microphones. This method basically works by extracting the sound signal received from far end microphone than the sound signal received from main microphone. The feature offered in Google Meet is implemented using a completely cloud-based infrastructure and machine learning, independent of user device.
A machine learning model (denoiser) needs to be trained to find out what is speech and what is not speech, to understand the difference between noise and speech, and then to filter only speech. Serge and his team use their own meetings to train the model, then the algorithm is matured by Youtube videos which includes many people and then manual verification methods. Ultimately, the system can intelligently filter background distractions such as dog barking, pen clicking and much more.
As you can see in the video below, while talking, Serge shows how the feature works by making noise with things like a nut bag, a pen and a glass-spoon. Non-routine noises are heard loud as soon as they start, but over time these noises are damped:
Google Meet Noise Cancellation Demo
As you can appreciate, your voice needs to be listened by Google in order to use a noise canceling system with artificial intelligence. The voice encrypted by the user is decoded and analyzed in Google data centers, and the filtered voice is also encrypted and transmitted to the users. Although the analysis of the sound by listening is a question mark on the part of the user, it is stated that this analysis is made only within denoiser. I think that it is very important to realize these transactions in a short time, especially for real-time communications.
To activate this feature, just click the three dots on the bottom right during the meeting and activate Noise cancellation from Settings:
Google Meet Noise Cancellation Settings
Last Words
The method of processing data in the center (in the cloud), which is a method that Google loves, and leaving the user side more lean, has also emerged in another area. For now, this service, which is still limited to G Suite Enterprise and G Suite Enterprise for Education customers, will be available to all Google Meet users soon. In the future, I think that Google may offer it to other service providers as a cloud service.
