I detect an echo problem in my voice network and after the TAC's diagnosis, they suggested me to upgrade the IOS version of my 2 Cisco Gateways 3825 because the dsp firmware was too old (4.4.708) and have echo problems. The older IOS version is 12.3(14)T7 and is in deffered state, they suggested me to upgrade my gateways to the 12.4(21) version which bring a new firmware. After the change I find that the new dsp firmware version is 4.4.29 and according to the evidence some echo troubles have been corrected. But I have a question, if the new dsp firmware version is apparently older than the initial one, does that new version have old already corrected caveats that I have to keep in mind? Should I look for another IOS version? Thanks for your answer.
We used to have some really bad intermittent Echo problems that were completely eliminated by going to IOS 12.4(15T1). I am pretty sure we were at 12.4(11) if my feeble mind can remember. The DSP version with 12.4(15)T1 is 9.4.0
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...