If you are using high bandwidth codec, like g711, then the dtmf digits will be transmitted as part of the RTP stream and hence you cannot disable it.
If you use a low bandwidth codec, like g729, there are chances that the dtmf signals can get distored during compression/decompression and hence the gateway will need to be setup to relay dtmf signals out of band. If you do not configure dtmf-relay on the gateways, that might help in this situation. That is not actually disabling dtmf, because the dtmf can still be transmitted via the RTP stream and there are chances that the dtmf is still clear even after the codec compression.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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 ...