I just tested in our alpha deployment with Expressways and transfer worked. Did a call between Jabber Guest and EX90 then transferred to Jabber. What is the VMR you are transferring too?
Also what happens when the transfer fails? Does the call just drop from Jabber Guest perspective, or is there an error displayed on the Jabber Guest client?
As for logging, you can downloads logs through the Admin, go to Logs, Web Application Log.
Reproduce the problem then download the current log. You should be able to see the SIP messages passing through Jabber Guest from there. However, you might be best served opening up a TAC case to investigate this issue further.
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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
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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 ...