Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

second line ATA 186


The second line of ATA186 does not work.

I add a new ATA with the MAC address changed on the first digit (01).

But the "new" ATA does not registred ...

Thank's for your help


Re: second line ATA 186

Just a clarification, so you have added the first ATA 186 to CCM with the given MAC address (example 001A2B3C4A5B).

When you add in the second ATA 186 (same device just second port) you are changing the first digit to 01.

So, are you making the new MAC address 011A2B3C4A5B? or 1A2B3C4A5B01?

Because you should be dropping off the first two characters of the MAC address and adding the 01 to the end. So, 1A2B3C4A5B01 would be the correct configuration.


Please rate post if helpful

New Member

Re: second line ATA 186

How do you turn off the second port on an ATA? I would like it not to register with Call Manager and thus use up DLUs for unused ports or cause transient connection errors.



Hall of Fame Super Red

Re: second line ATA 186

Hi Steve,

Here is the process;

Note: By default, both Cisco ATA FXS ports are enabled for Cisco CallManager registration. If you do not want to add the Phone 2 FXS port to Cisco CallManager, you must change the Cisco ATA EPID1orSID1 parameter value to 0 to disable the Phone 2 port. (To disable the Phone 1 port, you must change the EPID0orSID0 parameter value to 0.)

Hope this helps!