Solved

Audio drop outs on VOIP calls in one direction

Posted on 2015-02-08
6
163 Views
Last Modified: 2015-03-30
I am experiencing audio drop outs on VOIP calls (in one direction only).  The problem is intermittent and it only affects external calls.  We have 120 internal extensions and we experience no problem on internal calls. Also, external callers can always here us, but we cannot hear them for 10-30 seconds periods.  All calls connect fine, and the audio almost always comes back if the caller waits.   I have replaced the router, PBX, switches, and changed our VOIP service provider all to no avail.   I have also checked, tested, and replaced every cable that is not buried behind a wall.  Nothing has helped.

The network topology is: Draytek router connects to root swtich (Cisco SG300) and 12 switches connect to that.  PBX is a Asterisk based system managed by a small company called Intuitive Voice.  I have re-installed the PBX software, changed the hardware host, reconfigured all the network switches (enabled/disabled STP, QoS, VLAN settings) with no apparent impact on the issue.

I have conducted packet captures using wireshark at two locations on the data/VOIP path.  One at the router and another at the root switch.  The audio is perfect as it enters and leaves the router (no drops detected), but it drops when it leaves the root switch and goes to the PBX.  I have several captures available for analysis but Experts Exchange site does not allow me to upload the pcapng format.
0
Comment
Question by:DarrenMcIntyre
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
6 Comments
 
LVL 32

Expert Comment

by:Kamran Arshad
ID: 40597750
Hi,

What codec are you using? Did you try to change the codec.
0
 

Author Comment

by:DarrenMcIntyre
ID: 40598452
I am using G.711.  What codec would you suggest I switch to?  And why?
0
 
LVL 32

Expert Comment

by:Kamran Arshad
ID: 40598454
and these are SIP based clients or IaX?
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 

Author Comment

by:DarrenMcIntyre
ID: 40599239
SIP
0
 

Accepted Solution

by:
DarrenMcIntyre earned 0 total points
ID: 40688324
I resolved this issue by manually assigning the QoS values on the VOIP traffic from the firewall.
0
 

Author Closing Comment

by:DarrenMcIntyre
ID: 40695570
none of the other comments led to a solution
0

Featured Post

Free NetCrunch network monitor licenses!

Only on Experts-Exchange: Sign-up for a free-trial and we'll send you your permanent license!

Here is what you get: 30 Nodes | Unlimited Sensors | No Time Restrictions | Absolutely FREE!

Act now. This offer ends July 14, 2017.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Large and small networks have one same need, Service monitoring. Service monitoring consists of watch services of the several servers in the network. To monitor means that the administrator will receive an alert when a service is down or it's state …
There are no good configuration guides for HP-H3C router to LYNC on the web. :( Big statement, but we havent been able to find one yet. We did find the following document useful, but the information was not enough to use H3C router for use as a L…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

724 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question