Hangup on keypress

I have a unique problem. Everytime I pickup the line and press a button (doesn’t matter which one) asterisk drops the call and I receive a fast busy tone. Has anyone see or heard of this before?

CLI output:

Connected to Asterisk currently running on (pid = 2261)
Verbosity was 3 and is now 33
– Remote UNIX connection
– Starting simple switch on 'DAHDI/4-1’
– Hanging up on ‘DAHDI/4-1’
– Hungup ‘DAHDI/4-1’
– Starting simple switch on 'DAHDI/4-1’
– Hanging up on ‘DAHDI/4-1’
– Hungup ‘DAHDI/4-1’

How are we supposed to know what system you are running?

Clearly DAHDI/4/1 is not in a context that matches the digits you are dialing.

Is this a FreePBX based system?

Yes, its CentOS 5.6 with a TDM400P pci card, 1 FXO module, port 4. I am trying (failing miserably) to figure out why asterisk is dropping the call on the DTMF tone

what other specs do you need?

asterisk 1.8
dahdi - current
libpri - current
libss7 - current
iksemel - current


Please post the output of asterisk CLI command ‘dahdi show channel 4-1’

dtc-pbx1CLI> dahdi show channel 4-1
Channel: 4
File Descriptor: 17
Span: 1
Dialing: no
Context: internal
Caller ID:
Calling TON: 0
Caller ID subaddress:
Caller ID name:
Mailbox: none
Destroy: 0
InAlarm: 0
Signalling Type: FXO Kewlstart
Radio: 0
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: no
Busy Detection: no
TDD: no
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: ulaw
Fax Handled: no
Pulse phone: no
Gains (RX/TX): 1.75/2.00
Dynamic Range Compression (RX/TX): 0.00/0.00
DND: no
Echo Cancellation:
128 taps
(unless TDM bridged) currently OFF
Wait for dialtone: 0ms
Actual Confinfo: Num/0, Mode/0x0000
Actual Confmute: No
Hookstate (FXS only): Onhook