It depends on the gateway protocol in use. If it is an H.323 gateway, the call will be dropped. If you're using MGCP, the call will be preserved. Please see the Call Preservation section of the following link for confirmation.
If you have a call stream going from your IP phone to your local gateway, and the connection to the call manager fails due to a loss of a WAN link, the call becomes orphaned. You may loose certain features like the ability to put a call on hold. However, your call continues and the phone will not reregister with the router until after the call is finished.
Once the phone reregisters with the router (in srst mode) you will gain back many of the lost features.
Prior to 12.3(7)T1 MGCP was the only protocol that supported "call preservation". H.323 gateways would have calls drop after a random time frame (somewhere around 2 - 5 minutes). MGPC did NOT however support call preservation for PRI's:
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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 ...