Again, echo is not a QoS problem... jitter and drop-outs are.
The Polycoms are set for default of DSCP 46 (express forwarding). You need to enable QoS on your network switches... and make sure that DSCP 46 traffic is going into the low latency traffic queues. If you have an HP switch this is very east... 'qos type-of-service diff-services'. If you have something else... good luck J From: sipx-users-boun...@list.sipfoundry.org [mailto:sipx-users-boun...@list.sipfoundry.org] On Behalf Of Todd Hodgen Sent: Friday, May 14, 2010 1:18 PM To: 'Josh Patten'; sipx-users@list.sipfoundry.org Subject: Re: [sipx-users] Polycom IP HD 550 echo problem I think a good understanding of echo and where it comes from is helpful. http://www.ditechnetworks.com/learningCenter/echoBasics.html It will likely change your perspective of where to search for it. From: sipx-users-boun...@list.sipfoundry.org [mailto:sipx-users-boun...@list.sipfoundry.org] On Behalf Of Josh Patten Sent: Friday, May 14, 2010 6:23 AM To: sipx-users@list.sipfoundry.org Subject: Re: [sipx-users] Polycom IP HD 550 echo problem Generally phones on the same LAN that have echo are victims of either bad cabling, bad switching equipment, lack of QoS, or a combination of all three. It's not an easy problem to solve. Unfortunately echo is not something you can just "turn off". It something that can be minimized but not eliminated due to the nature of VoIP. Josh Patten Assistant Network Administrator Brazos County IT Dept. (979) 361-4676 On 5/14/2010 6:12 AM, Jermaine Pinder wrote: I have 10 Polycom HD 550 phones, latest boot-rom and firmware 3.23 running on sipx 4.2 that have "echo" problems sporadically. How can I turn off echo and any suggestions how to solve the problem? Thanks _______________________________________________ sipx-users mailing list sipx-users@list.sipfoundry.org List Archive: http://list.sipfoundry.org/archive/sipx-users Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-users sipXecs IP PBX -- http://www.sipfoundry.org/
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