Jump to content
Vodia PBX forum
Tony Yu

Jitter on calls

Recommended Posts

I need help troubleshooting the jitter we are getting on the calls.

 

We are running 4.5.0.1016 Alpha Monocerotids on 2.4Ghz Intel iMac with 4GB of Ram. Which should be sufficient to handle our load of calls (3 - 5 concurrent calls). Running the system over T1 line to Sip trunk from NexVortex. I have bound Affinity to CPU1 and set up QoS on the network. What is the next step?

 

Thanks,

Share this post


Link to post
Share on other sites

is it possible for to set up Port mirroring and capture a wireshark trace from another computer? also when you bound Affinity to CPU1 did you restart the service? Can you unbind the core and see if that makes a different in quality since we bind to core 1 by default?

Share this post


Link to post
Share on other sites

Well unfortunately a couple of things are different on Apple OS. http://superuser.com/questions/149312/how-to-set-processor-affinity-on-os-x says that this is not possible on MacOS; not sure if in the meantime the feature was added to the MacOS. Maybe until then, having more than one core on Mac is not a good idea :o

Share this post


Link to post
Share on other sites

is it possible for to set up Port mirroring and capture a wireshark trace from another computer? also when you bound Affinity to CPU1 did you restart the service? Can you unbind the core and see if that makes a different in quality since we bind to core 1 by default?

 

I've set up the wireshark and port mirroring, but unfortunately have no idea what to look for. Any help? I can email the file as it's 1.5MB and I cannot attach it here.

 

Thanks,

Share this post


Link to post
Share on other sites

is it possible for to set up Port mirroring and capture a wireshark trace from another computer? also when you bound Affinity to CPU1 did you restart the service? Can you unbind the core and see if that makes a different in quality since we bind to core 1 by default?

 

Not sure if there is any helpful information here besides that I am $%^& out of luck...???

Share this post


Link to post
Share on other sites

Not sure if there is any helpful information here besides that I am $%^& out of luck...???

 

Have you tried filtering the wireshark to only view the sip packets and saving them? have you tried what I mention above to un-bind the cpu core and restart the service?

Share this post


Link to post
Share on other sites

Have you tried filtering the wireshark to only view the sip packets and saving them? have you tried what I mention above to un-bind the cpu core and restart the service?

I have un-bound the cpu core, but I am unsure how to filter the wireshark to just see sip packets. Is there a simple tutorial around to do just this?

 

Thank you,

Share this post


Link to post
Share on other sites

The idea here was to use the Ethernet switch to do a port mirroring. This guarantees that Wireshark is not introducing new problems to the system. Then you can use another system to run Wireshark on the port mirror.

Share this post


Link to post
Share on other sites

The idea here was to use the Ethernet switch to do a port mirroring. This guarantees that Wireshark is not introducing new problems to the system. Then you can use another system to run Wireshark on the port mirror.

I think I did it right, but not sure. Wireshark file is attached.

 

Thanks,

sip.txt

Share this post


Link to post
Share on other sites

I think I did it right, but not sure. Wireshark file is attached.

 

Okay, getting closer. Now you have the SIP traffic (where jitter is not so important). Maybe you should just grab all the traffic so we can be sure that you also get the media (RTP) data.

Share this post


Link to post
Share on other sites

Just upgraded our system which has been working fine with no jitter to 4.5.1030. Now having the jitter problem. Had it on 4.5 Alpha also and ended up going back to 4.2. Haven't had time to test to see what was causing it.

 

Jeremy

Share this post


Link to post
Share on other sites

So, I have separated data trafic and voice trafic completely via adding a second nic and another data line, and the jitters are gone. But I am dropping calls left and right now. It appears to be happening mostly on the outbound calls. Please HELP

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...