1. Is this happening only to the AC user, or all phones?
2. If this is happening to random phones it is probably a CSS issue.
3. If this is happening to all phones perhaps you have "Block external call transfer" set to true. Have a look at the following doc;
Setting the Block OffNet to OffNet Transfer Service Parameter
The Cisco CallManager clusterwide service parameter Block OffNet to OffNet Transfer allows administrators to prevent users from transferring external calls to another external number. This parameter specifies values as True or False. Setting the parameter to True blocks external calls from being transferred to another external device. The default value specifies False. You modify the Block OffNet to OffNet Transfer service parameter by using the Service Parameters Configuration window.
When a user tries to transfer a call on an OffNet gateway or trunk when the service parameter Block OffNet to OffNet Transfer is set to True, a message displays on the user phone to indicate that the call cannot be transferred.
Migration from Cisco CallManager release 3.3(4) to Release 4.1
To block the transfer of external calls to external devices in release 3.3(4), the system uses service parameter Block External to External Transfer. The value of this parameter (True or False) will migrate to the new service parameter, Block OffNet to OffNet Transfer, when upgrade to release 4.1 occurs.
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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 ...