Yes.
•IP500 Analog Phone 8 Card
When an IP500 Analog Phone 8 base card is fitted with an IP500 Analog Trunk daughter card, during power failure extension port 8 is connected to analog trunk port 12.
•IP500 ATM Combination Card/IP500 ATM Combination Card V2
On this card, during power failure, extension port 8 is connected to analog trunk port 12.
Emergency Only Power Failure Ports
During normal operation, these ports cannot be used. During power failure, the ports connect directly to an analog trunk port.
•IP500 Analog Trunk Daughter Card/IP500 Analog Trunk Daughter Card V2
Regardless of the IP500 card hosting it, during power failure pins 4 and 5 of port 12 are connected to pins 7 and 8.
Dermis and feline can be divorced by manifold methods.*
*(Disclaimer for all advise given)--'Version Dependent'