[LUG] asterisk dahdi issues

[stinga@xxxxxxxxxxxxx]

After working for about 12 months one of my incoming BT lines no longer  
works.

Connected to Asterisk 1.6.2.7 currently running on pbx (pid = 17274)
digium tdm400

Incoming call
[Oct 12 15:54:07] NOTICE[17983]: chan_dahdi.c:8436 ss_thread: Got event  
17 (Polarity Reversal)...
[Oct 12 15:54:09] WARNING[17983]: chan_dahdi.c:8497 ss_thread: CID  
timed out waiting for ring. Exiting simple switch

I get the above and nothing happens

outbound
dialing 417070 from 01736.
[Oct 12 15:55:22] WARNING[17995]: app_dial.c:1747 dial_exec_full:  
Unable to create channel of type 'dahdi' (cause 0 - Unknown

dahdi channel info
chan 3 works chan 4 does not

pbx*CLI> dahdi show channel 3
Channel: 3
File Descriptor: 13
Span: 1
Extension:
Dialing: no
Context: indial-work
Caller ID:
Calling TON: 0
Caller ID name:
Mailbox: 6001
Destroy: 0
InAlarm: 0
Signalling Type: FXS Kewlstart
Radio: 0
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
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
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): Offhook
pbx*CLI> dahdi show channel 4
Channel: 4
File Descriptor: 14
Span: 1
Extension:
Dialing: no
Context: indial-home
Caller ID:
Calling TON: 0
Caller ID name:
Mailbox: 6001
Destroy: 0
InAlarm: 1
Signalling Type: FXS Kewlstart
Radio: 0
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
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
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

The hookstate is different, onhook vs offhook

swapping the lines over on the tdm400 gives the same results but  
different channel numbers.

any idea's what I can look at.
I have discovered my line on a dacs, I am not sure when that happened.

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