The dtmf events packets send by CUCMBE have incorrect UDP Length. Based on RFC 2833 a correct UDP length value for dtmf event packets is 24 (decimal), but this CUCMBE sends its events packets with UDP length set to 36 (decimal). Since the events packets have an incorrect udp length field, it is causing the ITSP to discard the packet. The CUCMBE version is 18.104.22.168000-1.
The attachment fiel TestNo1.bmp is a capture with wireshark that show the udp length with 36. It was taken in CUCMBE version 7.1.3
However, with a CUCMBE version 8.6.2 it works well and it formats the events packets with udp length with 24.
The attachment fiel GoodTestNo.bmp is a capture with wireshark that show the udp length with 24. It was taken in CUCMBE version 8.6.2
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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 ...