When your location goes to SRST mode, the "Manager phone" registers to the router, and works as an "standalone phone". All phones at the SRST location are at the same "partition" (unless you configured COR for phones and dial-peers). So, when someone calls the manager's phone, it will ring directly. Also, if you want to preserve 4-digits dialing, you must configure some kind of mechanism (for example, translation pattern) at your Main Location to reach phones at the SRST site.
What you mean under the definition "isdn backup"? Is it another gateway/route group/route list?
Anyway, consider the router in SRST mode as a standalone router. It means you must configure dial plan manually (controller, voice ports, dial peers, COR, etc.). So, let's say if you have a primary T1 and backup ISDN, you will need to configure them separately, create dial peers for required dial patterns, and assign lower priority to ISDN dial-peers.
CCNP, CCDP, CCSP, CCVP, MCSE W2K, CCIE Voice (in progress)
If it is a regular WAN backup, then, when the IP connectivity between the Main Site and Remote Site established, the Remote Site should switchback from SRST mode to a regular mode. However you must carefully plan for CAC - basically you will be replacing your WAN link with a "128k WAN link" without informing CallManager about it, so, you can easily oversubscribe it with just a couple calls.
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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 ...