Solved

SIP Traffic and Jitter & shoretel

Posted on 2014-09-15
6
301 Views
Last Modified: 2014-11-26
Getting a number of users complaining of poor voice quality.
I have spoken to both our comms and phone suppliers, not much help.

i've been notified of issues at both our sites.  Both sites are configured the same (in terms of hardware) the phone system is shoretel.
The l3 switch going through a cisco asa firewall is an hp 2910 al poe.  Routing all traffic to the firewall.
The only different i can see is the remote site has not got QOS enabled to Differential Services.  SHould this be enabled in order to help jitter at site b?

What else can i check/enable to help with jitter.
Our 10mb links are running at about 2mb on average.
0
Comment
Question by:CHI-LTD
[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 15

Accepted Solution

by:
getzjd earned 500 total points
ID: 40325106
Do you have MPLS and COS enabled between those links?
Does this occur both intrasite and intersite?
Have you enabled QoS priority on the hp 2910 for voice traffic?
What is your disserv setting in ShoreTel (call control --> options) ?
0
 
LVL 1

Author Comment

by:CHI-LTD
ID: 40325594
no we have a 10mb link over vpn.
both sites.
yes, and just enabled diff-serv on the other switch that had issues
104
0
 
LVL 15

Assisted Solution

by:getzjd
getzjd earned 500 total points
ID: 40325737
So if a user at site B calls another user also at site B, they receive jitter?    

Do you have QoS applied to the VPN tunnel between sites?   If these are standard internet lines, you will be at the mercy of the internet as soon as your data leaves the modem/router
0
Increase Agility with Enabled Toolchains

Connect your existing build, deployment, management, monitoring, and collaboration platforms. From Puppet to Chef, HipChat to Slack, ServiceNow to JIRA, Splunk to New Relic and beyond, hand off data between systems to engage the right people.

Connect with xMatters.

 
LVL 1

Author Comment

by:CHI-LTD
ID: 40327608
no internal seems more reliable.
i believe the firewalls do priority os have say 2mb dedicated to voice.
0
 
LVL 1

Author Comment

by:CHI-LTD
ID: 40341259
would a higher compress codec e.g. 729 help?
0
 
LVL 1

Author Comment

by:CHI-LTD
ID: 40415543
would qos on a link thats not being hit hard still help?
0

Featured Post

Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

Question has a verified solution.

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

Let’s list some of the technologies that enable smooth teleworking. 
Don’t let your business fall victim to the coming apocalypse – use our Survival Guide for the Fax Apocalypse to identify the risks and signs of zombie fax activities at your business.
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

717 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