I have a IP04, release 383, that is unhappy with its FXO cards.  Everything else works fine.  It was working on the FXO side just fine then all calls went to pure static on outbound calling.  I replaced the card with a know good card and it did not correct the issue. 

I placed an analog performance meter in series with the PSTN line connected to the FXO card in port 3.  When I dial out CLI show it dial out g1, the call goes to static but I do not see the off hook condition on my meter or the call actually attempt to go out.  ??

Anyone else run into the before?

Also, can anyone tell me if the FXO card operation is critical to the characteristics of the analog line it is connected to?  I'm asking because PSTN emulated lines from ATAs and some cable TV delivered dial tone services do not match the on hook voltage of a standard POTS line.  I'm not seeing the average -48Vdc voltage from these lines and I do see a wide range of incoming ring voltages and AC wave shapes with these types of POTS alternatives. 

Does anyone know how wide the operational window is for the FXO card sets?

/var/log/messages show this:

<log snip>
Jan  1 00:00:15 IP04 user.info kernel: dahdi: Telephony Interface Registered on major 196
Jan  1 00:00:15 IP04 user.info kernel: dahdi: Version: 2.3.0.1
Jan  1 00:00:15 IP04 user.warn kernel: bfsi_sport_init res: 1
Jan  1 00:00:15 IP04 user.warn kernel: After DASIY
Jan  1 00:00:15 IP04 user.warn kernel: port: 1 port_type: S
Jan  1 00:00:15 IP04 user.warn kernel: port: 2 port_type: S
Jan  1 00:00:15 IP04 user.warn kernel: port: 3 port_type: O
Jan  1 00:00:15 IP04 user.warn kernel: port: 4 port_type: -
Jan  1 00:00:15 IP04 user.warn kernel: port: 5 port_type: -
Jan  1 00:00:15 IP04 user.warn kernel: port: 6 port_type: -
Jan  1 00:00:15 IP04 user.warn kernel: port: 7 port_type: -
Jan  1 00:00:15 IP04 user.warn kernel: port: 8 port_type: -
Jan  1 00:00:15 IP04 user.warn kernel: ProSLIC module is Si3215
Jan  1 00:00:15 IP04 user.warn kernel: Start manual calibration
Jan  1 00:00:15 IP04 user.warn kernel: Module 0: Installed -- AUTO FXS
Jan  1 00:00:15 IP04 user.warn kernel: ProSLIC module is Si3215
Jan  1 00:00:15 IP04 user.warn kernel: Start manual calibration
Jan  1 00:00:15 IP04 user.warn kernel: Module 1: Installed -- AUTO FXS
Jan  1 00:00:15 IP04 user.warn kernel: Module 2: Installed -- AUTO FXO (FCC mode)
Jan  1 00:00:15 IP04 user.warn kernel: Found: Blackfin IP0x (8 modules)
Jan  1 00:00:15 IP04 user.warn kernel: wcfxs_init_ok = 1
Jan  1 00:00:15 IP04 user.info kernel: dahdi_echocan_oslec: Registered echo canceler 'OSLEC'
Jan  1 00:00:15 IP04 user.info kernel: dahdi: Registered tone zone 0 (United States / North America)

Asterisk says:

IP04*CLI> dahdi show channels
   Chan Extension  Context         Language   MOH Interpret       
pseudo            default                    default             
      1            DLPN_All_Call_T            default             
      2            DLPN_All_Call_T            default             
      3            DID_trunk_1                default

IP04*CLI> dahdi show channel 3
Channel: 3
File Descriptor: 12
Span: 1
Extension:
Dialing: no
Context: DID_trunk_1
Caller ID:
Calling TON: 0
Caller ID name:
Destroy: 0
InAlarm: 0
Signalling Type: FXS Loopstart
Radio: 0
Owner: <None>
Real: <None>
Callwait: <None>
Threeway: <None>
Confno: -1
Propagated Conference: -1
Real in conference: 0
DSP: no
Relax DTMF: no
Dialing/CallwaitCAS: 0/0
Default law: ulaw
Fax Handled: no
Pulse phone: no
Echo Cancellation: 128 taps, currently OFF
DSP cycles last: 4961 worst: 5666 average: 4891 sample: 0
Actual Confinfo: Num/0, Mode/0x0000
Actual Confmute: No
Hookstate (FXS only): Offhook

IP04*CLI>

Thanks, in advance, for any suggestions.