SIDx specifies whether to enable the Phone 1 and/or Phone 2 ports on the Cisco ATA to register with Cisco Call Manager. (EPIDx is not for SCCP.) SIDx can be one of the following values:
•0—Disables port; port does not attempt to register with Cisco CallManager
•. or <mac_address>—Uses the default Skinny ID, which is the Cisco ATA MAC address (MAC) for the Phone 1 port and MAC[1-5]+01 for the Phone 2 port. The port attempts to register with Cisco CallManager.