1- Publisher-->Subscriber. This is based on SQL. The first CM you install at a site will be a publisher. Only the publisher has READ/WRITE access to the SQL database which contains all of the configs for CM. Each additional CM you install will be a subscriber with read only access to database. The Publisher will push the database to the subscriber. Changes cannot be written back to the publisher from the subscriber. Configuration changes can only be made at the publisher.
2- Primary-->Secondary. This is based on what CM the phones register to. When you setup the call manager group, then configure a device pool to use that group you are saying to the phones- "Register with CM1 as your primary call processor, but keep a connection to CM2 in case CM1 goes down." You can have as many as 5 CM in a group, but active connections are only to the first 2. If you have a large install (more than 2 CM) you can create multiple CM groups with different primary and secondary CMs
Services- Backup CM for phones, TFTP, DHCP, Enterprise services, services, any cti applicaitons (ext mobility, ICD, etc...)
Services- Primary CM for phones.
I allow the subscriber to do all of the call processing, while the publisher does all of the other little tasks (tftp, services, directories, etc...). I you have more than 2 servers, you can have more division of services.
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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 ...