If a customer is interested in using the second port of an ATA, You are in Luck. This is possible and supported. Keep in mind though that even though it is on the same device, it will require you to use a different MAC and therefore use a separate device license in CUCM
Cisco uses a standard method to create a new MAC address:
1. Take the MAC address for port 1. For example, 00:00:DE:AD:BE:EF.
2. Drop the first two digits from the MAC address. In the example, 00:DE:AD:BE:EF.
3. Append “01” to the end of the 10-digit address. Example, 00:DE:AD:BE:EF:01.
Once you’ve completed those steps, take the MAC address you’ve just created and plug it into Connect with a unique name and its own DN.
It will be treated as though it is an entirely different ATA device.