Why assign MAC Address manually to IP phone in CME

If I am not wrong when IP phone registers with CME , we will be able to see the MAC address of the phone, by typing in CME : show ephone

However I have seen Admins assigning MAC address manually :
ephone 1
mac-address aaaa.aaaa.aaaa

What is the purpose of changing MAC addresses?

Any idea ?

Thank
jskfanAsked:
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José MéndezConnect With a Mentor Commented:
Each phone is provisioned with individual settings that could differ from the rest of phones. Each phone requestes a file called SEPAAAABBBBCCCC.cnf.xml, which it parses to adjust its behavior according to what you configure for each ephone.
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jskfanAuthor Commented:
I thought each IP phone when it boots up, it registers its MAC address with CME.
There is no need for the Administrator to type it manually.
Example:
ephone 1
 mac-address aaaa.aaaa.aaaa
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agonza07Connect With a Mentor Commented:
It's just a way to control the configuration. Not sure how familiar you are with routers, but sort of like working with static routes instead of a routing protocol doing it automatically for you. Or also like working with CLI vs GUI, some people just have a preference of one vs. the other.

Even when the phone registers automatically the mac address is inserted into the configuration, so if the mac address shows up on the configuration it doesn't necessarily mean it was typed in manually. Just FYI on that.
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jskfanAuthor Commented:
What I think Statically typing MAC address reason is, may be for  CME  reboots or IP phone reboots.

on CME we configure : ephone-dn and number
if we do not configure static MAC, then the ephone-dn and number can be assigned to different IP Phone when there is a reboot of either devices ....That's my Guess
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agonza07Connect With a Mentor Commented:
It has to be put in the configuration one way or another. Whether typed or automatically inserted.

Don't hold me to it, but I think even in with auto registration it saves the configuration for you, so even a reboot will not erase that configuration.

it needs that mac -address command one way or another otherwise it won't work.
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jskfanAuthor Commented:
Thank you Guys!
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