SRW Series QoS configuration for VoIP

Hello Cisco experts,
I have SRW224G4 switch in an office connected to the internet through port1, Asterisk server through port 9, Internal computers through ports 16-24.
Currently, voice is cutting in the inbound direction when computer users are using Internet. I am trying to make some QoS configuration in which remote IAX2 phone, which uses UDP port 4569, will not be affected by Internet usage made by internal computers.
I have logged in to the switch management webpage, I found a section for (QoS), but I need some help in specifying which parameter should I configure.
Internet connection speed is 1mbps DL / 512kbps UL. I can configure Asterisk to mark packest with some TOS if required.

One way to do it would be to configure Asterisk to assign a DSCP value of 46 to voice packets.
Then on the SRW224G4, use:
CoS Settings tab / QoS mode: Basic
Basic tab / Trust mode: DSCP
That would give priority to voice packets inside your network.
Possible problems:
your ISP will most likely clear DSCP markings on packets going out of the network
rare case: your ISP might charge you more for packets marked with DSCP 46 (not likely on an ADSL connection)
bottleneck will be the ADSL router, so if possible, you should implement QoS based on DSCP on that device
if some PC based software uses DSCP markings, it'll get priority also
Hope this helps!
Cheers,
Tamas

Similar Messages

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    Hi
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    1
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    Data
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    Thanks
    please rate all useful information

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    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
    Posting
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    Image: http://i40.tinypic.com/2qi02z5.jpg
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