Text phone is not able to validate

hi ,

we  configured the service provider  properly and we added the  text phone device while  validating   in device log file i am  getting error  message as connection failure .please  help us to resolve the issue

Error Message

2013-04-03 08:51:26,041 [tapEngineManager-process-pool-thread-5] DEBUG   -  - =>AT&FE0F1<CR>

2013-04-03 08:51:46,056 [tapEngineManager-process-pool-thread-5] DEBUG   -  - Close serial port

2013-04-03 08:51:46,150 [tapEngineManager-process-pool-thread-5] DEBUG   -  - Close input stream

2013-04-03 08:51:46,150 [tapEngineManager-process-pool-thread-5] DEBUG   -  - Close output stream

2013-04-03 08:51:50,150 [tapEngineManager-process-pool-thread-5] DEBUG   -  - TAP: Connection closed.

2013-04-03 08:51:50,150 [tapEngineManager-process-pool-thread-5] DEBUG   -  - Send notification event. Notification ID: 611152 Status: CONNECTION_FAILURE

2013-04-03 08:51:53,712 [TAPDeviceEngineInternalEventTimer] DEBUG   -  - Send work request. Cluster:  Protocol: TAP Number of resources: 1

2013-04-03 08:51:56,134 [tapEngineManager-process-pool-thread-1] DEBUG   -  - =>AT&FE0F1<CR>

2013-04-03 08:52:16,149 [tapEngineManager-process-pool-thread-1] DEBUG   -  - Close serial port

2013-04-03 08:52:16,243 [tapEngineManager-process-pool-thread-1] DEBUG   -  - Close input stream

2013-04-03 08:52:16,243 [tapEngineManager-process-pool-thread-1] DEBUG   -  - Close output stream

2013-04-03 08:52:20,243 [tapEngineManager-process-pool-thread-1] DEBUG   -  - TAP: Connection closed.

2013-04-03 08:52:20,243 [tapEngineManager-process-pool-thread-1] DEBUG   -  - Send notification event. Notification ID: 611152 Status: CONNECTION_FAILURE

2013-04-03 08:52:23,727 [TAPDeviceEngineInternalEventTimer] DEBUG   -  - Send work request. Cluster:  Protocol: TAP Number of resources: 1

2013-04-03 08:52:26,071 [tapEngineManager-process-pool-thread-2] DEBUG   -  - =>AT&FE0F1<CR>

2013-04-03 08:52:46,086 [tapEngineManager-process-pool-thread-2] DEBUG   -  - Close serial port

2013-04-03 08:52:46,180 [tapEngineManager-process-pool-thread-2] DEBUG   -  - Close input stream

2013-04-03 08:52:46,180 [tapEngineManager-process-pool-thread-2] DEBUG   -  - Close output stream

2013-04-03 08:52:50,180 [tapEngineManager-process-pool-thread-2] DEBUG   -  - TAP: Connection closed.

2013-04-03 08:52:50,180 [tapEngineManager-process-pool-thread-2] DEBUG   -  - Send notification event. Notification ID: 611152 Status: CONNECTION_FAILURE

2013-04-03 08:52:53,742 [TAPDeviceEngineInternalEventTimer] DEBUG   -  - Send work request. Cluster:  Protocol: TAP Number of resources: 1

2013-04-03 08:52:56,117 [tapEngineManager-process-pool-thread-3] DEBUG   -  - =>AT&FE0F1<CR>

2013-04-03 08:53:16,132 [tapEngineManager-process-pool-thread-3] DEBUG   -  - Close serial port

2013-04-03 08:53:16,226 [tapEngineManager-process-pool-thread-3] DEBUG   -  - Close input stream

2013-04-03 08:53:16,226 [tapEngineManager-process-pool-thread-3] DEBUG   -  - Close output stream

2013-04-03 08:53:20,226 [tapEngineManager-process-pool-thread-3] DEBUG   -  - TAP: Connection closed.

2013-04-03 08:53:20,226 [tapEngineManager-process-pool-thread-3] DEBUG   -  - Send notification event. Notification ID: 611152 Status: CONNECTION_FAILURE

2013-04-03 08:53:23,742 [TAPDeviceEngineInternalEventTimer] DEBUG   -  - Send work request. Cluster:  Protocol: TAP Number of resources: 1

2013-04-03 08:53:33,757 [TAPDeviceEngineInternalEventTimer] DEBUG   -  - Send work request. Cluster:  Protocol