after the command 'debug ephone detail' restarted cisco IP Phone on PC, nothing has happened





CME_c7200#sh eph
CME_c7200#sh ephone

ephone-1[0] Mac:0200.4C4F.4F50 TCP socket:[-1] activeLine:0 whisperLine:0 UNREGISTERED
mediaActive:0 whisper_mediaActive:0 startMedia:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:0
IP:0.0.0.0 0 Unknown 0  keepalive 0 max_line 0 available_line 0
Preferred Codec: g711ulaw

CME_c7200#
CME_c7200#
CME_c7200#
CME_c7200#debug ephone detail
This may severely impact system performance. Continue? [confirm]
EPHONE detail debugging is enabled (detail, state, registration, video, error)
CME_c7200#
CME_c7200#
CME_c7200#no debug ephone detail
EPHONE detail debugging is disabled (detail, state, error, regirstraiton, video)
CME_c7200#
CME_c7200#