[cisco-voip] Using fax with ATA SCCP

[Ciscozest]

I have MGCP/SRST gateway with ATA SCCP and a fax machine connect to it in branch office. The CallManager is in HQ. When 
SRST mode is active, I know IP Phones (SCCP) are able to register to SRST gateway and still function properly. How about 
the ATA? Does it able to failover/register with SRST gateway and maintain my fax functionality during SRST mode? If not, 
any suggestion to eliminate this problem? thanks