SIP Traffic and Jitter & shoretel

Posted on 2014-09-15
Medium Priority
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.
Question by:CHI-LTD
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LVL 15

Accepted Solution

getzjd earned 2000 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) ?

Author Comment

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
LVL 15

Assisted Solution

getzjd earned 2000 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
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Author Comment

ID: 40327608
no internal seems more reliable.
i believe the firewalls do priority os have say 2mb dedicated to voice.

Author Comment

ID: 40341259
would a higher compress codec e.g. 729 help?

Author Comment

ID: 40415543
would qos on a link thats not being hit hard still help?

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