If you're tagging every packet ("on all interfaces") with the same QoS
markings it's not really QoS is it?
What you have to do is either have your switches or phones tag their
packets with QoS markings. In the case of the switches, ONLY tag QoS on
the VLAN, not on the entire switch. I did this once with my HP switches
and things went nuts until I fixed it.
You also probably need to implement "layer 3" QoS in the watchguard,
stating that packets from the IP address of your sipX server(s) have
higher priority on the internet connection.
Make sure you set up your QoS bandwidth on the watchguard as well
otherwise the router won't know when to limit non-priority traffic.
On 06/17/2010 02:32 PM, Tran, Ly V. wrote:
Both the phone system and computers are all connected to a Cisco 3550
/ 3560 switch. From there, to the Firebox. As far as QOS goes on the
switches, I've been told that the default Auto QOS config is applied.
I'm more of a server guy, so I'm not an expert at Cisco hardware.. I
just need to find out what is the best config is and pass it along to
our network person to configure. Our ITSP is Voxitas, but we are not
using their MPLS service or have a dedicated connection to them. The
Internet connection we have is a fiber DIA in which the ISP says every
packet passes through, no QOS on their end and that we implement the
tagging and it should pass through. QOS on the firebox is set with
DSCP marking with an Assigned 46(EF) value on all the interfaces. I
suppose we will have to match that on the switches.
Ly Tran
*From:* sipx-users-boun...@list.sipfoundry.org
[mailto:sipx-users-boun...@list.sipfoundry.org] *On Behalf Of *Josh Patten
*Sent:* Thursday, June 17, 2010 12:37 PM
*To:* sipx-users@list.sipfoundry.org
*Subject:* Re: [sipx-users] QOS Best Practices for VOIP?
There's nothing on the other side of the equals sign.
You haven't told us anything about how QoS tagging is done internally
before it reaches the firebox. Who is your ITSP? Are you tagging
packets at the switch level for the voice VLAN?
More details are necessary.
On 06/17/2010 12:30 PM, Tran, Ly V. wrote:
What are the essentials that one can do to improve call quality in
using SipX? We have successfully replaced our Covad VOIP system with
SipX. Covad was using MGCP and we had a 1.5M sDSL line dedicated to
voice. In moving to SipX we installed a 10M DIA connection that comes
to us through fiber, and are sharing both voice/data. However, we are
still hearing from our users both remotely and internally that the
voice quality can be poor sometimes.. breaking audio or jitter. Our
setup consists of SipX using a siptrunk, behind a Watchguard Firebox.
The phone system is on its own VLAN. I understand that once it enters
the Internet, its beyond our control.
We have configured the Watchguard for QOS, but not sure what the best
configuration is for SipX... ie. DSCP?
The phones we have are Cisco 7960s and LG 6812s.. are there specific
settings we can do on these phones to improve quality?
*Ly Tran*
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