Translating fax calls

[Essam Butt]

Hello,

I am using a translation pattern to forward incoming fax calls from PRI1 to PRI2. The scenario is as below:

PRI1>>>H323>>>CUCM>>>H323>>>PRI2>>>FAX

If I send a fax directly to PRI2, the fax is successfuly received without any errors.

But if I send a fax to PRI1, I do receive the fax but with lots of transmission errors.

Do I need to do anything on the GW or CUCM for this to work without any errors??

Thanks in advance,

[Chris Deren]

You need to ensure you are using same fax protocol on all call legs, also ensure there are no errors under "sh controller e1/t1". Are the 2 PRIs on the same GW or separate GWs?  How is your clocking setup.

HTH,

Chris

[Essam Butt]

The same fax protocol is used on all call legs, which is t38 and there are no errors for controller e1.

The 2 PRIs are on different GWs.

Network clocking is configured with controller interface e1.

Below is the printout for sh contorller e1:

E1 0/0/0 is up.

  Applique type is Channelized E1 - balanced

  No alarms detected.

  alarm-trigger is not set

  Version info Firmware: 20100222, FPGA: 13, spm_count = 0

  Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

  Data in current interval (346 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

  Total Data (last 24 hours)

     0 Line Code Violations, 0 Path Code Violations,

     0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

     0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Thanks,

[Chris Deren]

Is it protocol based or NSE based T38? Can you show your applicable configuration?

Chris

[Essam Butt]

Sorry for the late reply.

It's NSE based T38. Below is the configuration for fax:

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

no supplementary-service h225-notify cid-update

fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none

Thanks,

[Chris Deren]

This is not NSE configuration, NSE with H323 would be the following:

fax protocol t38 nse ls-redundancy 0 hs-redundancy 0 fallback cisco

yours is protocol-based, you will need to troubleshoot it with ideally pocket capture or "debug voip rtp session named-event", "debug fax relay t30 all-level-1 "

HTH,

Chris