I could be wrong but I don't think the 103 load is going to solve your echo issues. Are you seeing phone to phone echo or just phone to pstn echo. One thing we do around here is set a phone to call foward back out what ever pstn gateway we are using. The call that number and have a conversation between to pstn phones going over to b channels on the gateway. If you are getting echo in this cituation it sounds like you need to tune the db levels on the gateway or it could be the gateway. If this is fine and it is just phone to pstn it could be something in the phone load I guess.
The bug you referenced is phone to phone echo are you getting this as well?
We also had some echo problems on the base 3.1.2c phone loads. After upgrading to 3.1.3a the echo appears to be gone. Cisco Tac did also told us to put a newer level of phone load on. If you open a problem with Cisco TAC they should be able to email it to you along with instructions on how to apply it.
This is now fixed with phone load that comes with V313a - P003030108. But watch out for a bug with this phone load to do with transferring/holding/ending 1st call when a 2nd call comes in to a 2nd line and the options disappear. Need to get engineering phone load with this phone load P003030101B8 for this.
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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 ...