I wanted to know that how to configure 2 DN numbers on my ATA186. as i can easily configure single DN on my ATA and my port 1 of ATA show me dial tone, but when i try on port two it does not provide me dial tone , either port one works or port two work, becuase i can assign only one DN on my Call manager 6.0.
when i tired to assign 2nd DN i got error, i have attached the screenshot ,kindly correct it.
Hope all is well :) This question has thrown us all at one time or another. The Second Line on an ATA is actually added as a completely seperate device just using a modification of the original mac address.
Use this procedure to add the second port on the Cisco ATA 186 to Cisco CallManager.
Drop the first two nibbles of the MAC address and shift the MAC address to the left, then add 01 to the right end of the MAC address. For example 00070EA26032 is port 1 and 070EA2603201 is port 2.
From this good albeit "older" doc :)
Hope this helps!