Im not a voice guy, but let me try.
Ususally this behavior means that the 7970 is trying to boot up but for some reason it
can't. this happens after a CallManager reboot or a change in the Phone Load. The fix for
this (and almost everytime fix the issue) is below. Please follow this procedure to
restore the default configuration in a 7970 phone:
-Power off 7970.
-Power on 7970 (with a power-brick) while holding the # key.
-The lines lamp should blink amber in sequence. Release the # key.
-Enter: 1 2 3 4 5 6 7 8 9 * 0 #
-The lamps should blink green in sequence.
-The phone will obtain IP information via DHCP.
-The TERM70.default load will be loaded on the phone.
-The phone should recover the configuration file from CallManager,
if not reset with **#** and your confriguration will be restored
Note:
If you do not have a power-brick connected while doing the 'Factory Restore' then this
process will fail because the 7970 cannot TFTP the
TERM70.default load from itself with inline power. If you have a console connected you
will see:
CDP: power TLV's not detected - assume low power mode - pwr src = 1
Please refer to the following link if you have any doubts:
***Troubleshooting the Cisco IP Phone***
http://www-search.cisco.com/en/US/products/hw/phones/ps379/products_administ
ration_guide_chapter09186a00801d66cb.html#1085546
