Each dial peer or ephone-dn takes up around 5-10Kbytes of memory. If you have a large number of exising dial peers or configure the maximum setting for the CME max-dn, IOS will try and reserve memory, and in some cases fails with the listed message.
More often that not, there are two reasons why this happens.
1) The configured IOmem being set too high. If you do a SH VER, there will be a line something like this -
Cisco 3825 (revision 1.1) with 489472K/34816K bytes of memory.
The two figures added together give the total memory installed in the router (512 Meg) The first figure is system memory, and the second value is the reserved IOmem. If the IOmem is set too high, it may prevent memory being reserved for confiurable settings like dial peers. You can reduce the IOmem using the config command 'memory-size iomem ' and set a smaller value.
Once the value has been changed, you will need to reload the router for the new value to take effect.
Be sure to monitor the router operation if you change this setting as it could affect other packet processing functions if the router is switching a lot of traffic.
2) Memory has been reserved by a excessively large logging buffer, for example 'logging buffered 10000000' . Remove any such commands from the system config.
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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 ...