Callmanager and IP Phones definitely donot need a DNS for their operation, though its an option to use names instead of IP addresses. Unity requires that you integrate with Active Directory, which will require you to have DNS installed either on the local Unity machine or another Windows 2000 machine.
DNS is not necessary for Call Manager/Phones/Gateways. I always configure my systsems to use only IP Addresses, I don't want the phones to fail bacause of a DNS problem. However, if you decide to use DNS, any DNS server will do, it is a standard (the whole internet uses it). As mentioned above, unity will need DNS in the domain, but if you have a windows domain then that is already running anyway.
Be cautious with MGCP gateways. The hostname and domain name configured on the gateways is what is sent to CCM for the Domain Name under MGCP GW. If someone chnages a router hostname, domain name down the road down comes the calls.
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 ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...