06-16-2013 07:14 AM - edited 03-16-2019 05:54 PM
Hi,
How we can check voice latency of Cisco ip phones 7912 / 7960.
Plz see given below scenerio;
At Location A, Cisco call Manager and one ip phone placed
At Location B, only one ip phone is there
then what will be the testing process of voice Latency from Location B to Location A,
am i need to ping call Manager ip address from Location B or Ping Location A' ip phone
ip address ? I am very confused bcoz how can i ping remote location ip address from
ip phones ( ip phone is not like as computer) ?
KS
Solved! Go to Solution.
06-18-2013 08:02 AM
Kuldeep singh wrote:
Anybody can help me to check out voice latency
Read above.
06-16-2013 07:40 AM
CMR files can help you!
Export the CMR file and open it in Excel with Options (Delimited and Comma).
Tapan
06-16-2013 07:45 AM
What is CMR file and how to export it ? what types of logs it contain.
Can i not check voice latency through ping from Remote location ?
06-18-2013 08:24 AM
Tapan Dutt a écrit:
CMR files can help you!
Export the CMR file and open it in Excel with Options (Delimited and Comma).
Tapan
Can we trust CMR values ?
For example Latency on LAN between 2 phones 8945 shows sometimes more than 100 ms in CMR.
Due to the fact that bugs are existing concerning call quality parameters (CSCug69210 8945 SCCP firmware reporting incorrect jitter during video calls), I'm not sure if Latency has not the same bug.
Thanks,
JC
06-16-2013 07:55 AM
Latency is the same as ping RTT / 2.
It is what it is and doesn't really matter much, you can avoid thinking too much about it.
06-16-2013 08:05 AM
RTT / 2 ??? Plz give me one example
06-16-2013 09:05 AM
06-18-2013 08:00 AM
Anybody can help me to check out voice latency
06-18-2013 08:02 AM
Kuldeep singh wrote:
Anybody can help me to check out voice latency
Read above.
06-18-2013 08:35 AM
Hi Paolo,
Check Voice latency is very critial task for me bcoz we are responsible for detecting charges from one of our client
after seeing report of Latency, Availability and etc. That's way i am thinking lot...
KS
06-18-2013 08:57 AM
Is not that difficult if you could read above, what is not clear to you ?
06-18-2013 09:29 AM
Hello Paolo,
Why do you say about latency "It is what it is and doesn't really matter much" ?
I agree Packet Loss and Jitter have more visible impact if above what adaptative buffer and codec replay can deal with.
However (as far as I'm concerned) latency on the LAN shows there's an issue somewhere, even if not noticeable.
JC,
06-18-2013 09:31 AM
Jean-Christophe MAJCHRZAK wrote:
Hello Paolo,
Why do you say about latency "It is what it is and doesn't really matter much" ?
I agree Packet Loss and Jitter have more visible impact if above what adaptative buffer and codec replay can deal with.
However (as far as I'm concerned) latency on the LAN shows there's an issue somewhere, even if not noticeable.
JC,
What issue? OP has nor reported anything except his curiosity. At times I talk over sat circuits with 1 second RTT without any problem.
06-18-2013 09:47 AM
I agree with you. For remote locations, we also are for some offices far beyond the Cisco recommended maximum value of 150 ms latency.
On the LAN latency should be 1 ms and it's not the case for me. I've high latency values in CMR for LAN to LAN calls, also in the same building, and even if nobody noticed it I'm curious to find out the root cause.
JC.
06-18-2013 09:55 AM
To meaure latency properly you need expensive test devices, not ping to to/from PCs and routers.
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