SHOW VOICE PORT STATUS= SEIZEACK

[cesarpc04]

I've one problem when i try to make outside calls from CCM 4.1
i review the voice gateway and typed SHOW VOICE PORT :

each time that the call dont go out the Channel of Port of E1 shows STATUS= SEIZEACK
What is the mean of that status ??
DS0 channel specific status info:
IN OUT
PORT CH SIG-TYPE OPER STATUS STATUS TIP
1/0:0 01 r2-digital dorm idle idle
1/0:0 02 r2-digital dorm idle idle
1/0:0 03 r2-digital dorm idle idle
1/0:0 04 r2-digital dorm idle idle
1/0:0 05 r2-digital dorm idle idle
1/0:0 06 r2-digital dorm idle idle
1/0:0 07 r2-digital dorm idle idle
1/0:0 08 r2-digital dorm idle idle
1/0:0 09 r2-digital dorm idle idle
1/0:0 10 r2-digital dorm idle idle
1/0:0 11 r2-digital dorm idle idle
1/0:0 12 r2-digital dorm idle idle
1/0:0 13 r2-digital dorm idle idle
1/0:0 14 r2-digital dorm idle idle
1/0:0 15 r2-digital dorm idle idle
1/0:0 17 r2-digital dorm idle idle
1/0:0 18 r2-digital dorm idle idle
1/0:0 19 r2-digital up seizeack idle
1/0:0 20 r2-digital dorm idle idle
1/0:0 21 r2-digital dorm idle idle
1/0:0 22 r2-digital dorm idle idle
1/0:0 23 r2-digital dorm idle idle
1/0:0 24 r2-digital dorm idle idle
1/0:0 25 r2-digital dorm idle idle
1/0:0 26 r2-digital dorm idle idle
1/0:0 27 r2-digital dorm idle idle
1/0:0 28 r2-digital dorm idle idle
1/0:0 29 r2-digital dorm idle idle
1/0:0 30 r2-digital dorm idle idle
1/0:0 31 r2-digital dorm idle idle

Thanks