Cannot send/receive fax reliably. ATA 187, CUCM 10.0, 2911

[ksuchewie]

We have had ongoing issues with not being able to send/receive faxes reliably since we've installed this new phones system (previously we were on a Nortel system).

We are trying to fax using HP 4345 MFP, HP 3035 MPF, Richo MP 171.

Often faxes fail to send with a remote disconnect error or when we receive we only get about 1/2 of the page.

Where do I start looking first?  Is it the ATAs, CUCM, Voice Gateway or a combination?

[ksuchewie]

Attaching a screenshot of the ATA config in CUCM.

[ksuchewie]

Attaching show run from router.  I removed parts that showed passwords.

[Richard Bradfield]

You are most probably getting slips on the ISDN,  do a show controller T1 see if you are getting slip seconds

I would add the following to router config

" Network-clock-select 1 T1 0/0/0"

HTH
 

[ksuchewie]

rplus-2911-1#show controller t1
T1 0/0/0 is up.
  Applique type is Channelized T1
  Cablelength is long 0db
  No alarms detected.
  alarm-trigger is not set
  Soaking time: 3, Clearance time: 10
  AIS State:Clear  LOS State:Clear  LOF State:Clear
  Version info Firmware: 20100222, FPGA: 13, spm_count = 0
  Framing is ESF, Line Code is B8ZS, Clock Source is Line.
  CRC Threshold is 320. Reported from firmware  is 320.
  Data in current interval (213 seconds elapsed):
     0 Line Code Violations, 0 Path Code Violations
     8 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
     8 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
  Total Data (last 17 15 minute intervals):
     0 Line Code Violations, 0 Path Code Violations,
     551 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
     551 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 6 Unavail Secs

[ksuchewie]

I added the network-clock-select command.  I haven't seen anymore slip errors since but I'm not sure how much activity is on our phones today.

I also found that my ATA devices were configured for T.38 but the gateway was configured for pass through.  I updated the gateway to use t.38.