What was the triggering event that sent them into SRST?
On the device pool for this site what is the following set to:
Connection Monitor Duration
This setting defines the time that the IP phone monitors its connection to Cisco Unified Communications Manager before it unregisters from SRST and reregisters to Cisco Unified Communications Manager.
The default value, which specifies 120 seconds, resides in the Connection Monitor Duration enterprise parameter.
Change this setting if you need to disable the connection monitor (by changing the value to zero) or if you want to extend the connection monitor time.
Note : When you change the value of the connection monitor duration, it applies only to the device pool that is being updated. All other device pools use the value in their own connection monitor duration fields or use the value that is configured in the enterprise parameter.
It does sound like you have a network issue. The phones have managed to get to the CCM, or at least a TFTP server because they are aware of the SRST reference, and that is downloaded via TFTP. However, it sounds like they are missing enough keepalives to prohibit them from registering to the CCM.
I would investigate your 200ms delay and go forward from there.
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