Solved

Audio drop outs on VOIP calls in one direction

Posted on 2015-02-08
6
154 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
  • 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
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 

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

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

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

I recently purchased a Bluetooth headset called the Music Jogger (model BSH10). The control buttons on it look like this: One of my goals is to use it as the microphone and speakers for Skype calls. In that respect, it works well. However, I …
As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
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…

816 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

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now