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FAX at Cisco Unified Communication Express fails

HI,

we have a strange behaviour of fax at a Callmanager Express.

We confiogured CCME with a build in 4 -port FXS card. We register the FXS port 0/3/0 with SCCP and STCAPP at the CCME as ephone.

If we connect an analog phone at the port incoming and outgoing calls works fine.

Under voice service voip global configuration we configured fax protocol t38 with fallback passtrough g711alaw.

Now an incoming call to the fax machine:

Mar  4 13:42:02.334: ISDN BR0/0/1 Q931: RX <- SETUP pd = 8  callref = 0x35

        Sending Complete

        Bearer Capability i = 0x9090A3

                Standard = CCITT

                Transfer Capability = 3.1kHz Audio

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0x89

                Exclusive, B1

        Calling Party Number i = 0x2180, '12345'

                Plan:ISDN, Type:National

        Calling Party Number i = 0x2183, '12345'

                Plan:ISDN, Type:National

        Called Party Number i = 0xC1, '9999'

                Plan:ISDN, Type:Subscriber(local)

Mar  4 13:42:02.378: ISDN BR0/0/1 Q931: TX -> CALL_PROC pd = 8  callref = 0xB5

        Channel ID i = 0x89

                Exclusive, B1

Mar  4 13:42:02.398: ISDN BR0/0/1 Q931: TX -> ALERTING pd = 8  callref = 0xB5

        Progress Ind i = 0x8188 - In-band info or appropriate now available

Mar  4 13:42:10.122: ISDN BR0/0/1 Q931: TX -> CONNECT pd = 8  callref = 0xB5

        Channel ID i = 0x89

                Exclusive, B1

Mar  4 13:42:10.242: ISDN BR0/0/1 Q931: RX <- CONNECT_ACK pd = 8  callref = 0x35

Mar  4 13:42:10.246: %ISDN-6-CONNECT: Interface BRI0/0/1:1 is now connected to 12345 N/A

And now the output of show voice call summary:

At first:

ccme#sh voice call summary

PORT           CODEC     VAD VTSP STATE            VPM STATE

============== ========= === ==================== ======================

0/0/0.1       -          -  -

0/0/0.2       -          -  -

0/0/1.1       g711ulaw   n  S_CONNECT             S_TSP_CONNECT

0/0/1.2       -          -  -

0/2/0.1       -          -  -

0/2/0.2       -          -  -

0/2/1.1       -          -  -

0/2/1.2       -          -  -

0/3/0         g711ulaw   n  S_CONNECT             FXSLS_CONNECT

Than it changes to:

ccme#sh voice call summary

PORT           CODEC     VAD VTSP STATE            VPM STATE

============== ========= === ==================== ======================

0/0/0.1       -          -  -

0/0/0.2       -          -  -

0/0/1.1       modem-rel  n  S_CONNECT             S_TSP_CONNECT

0/0/1.2       -          -  -

0/2/0.1       -          -  -

0/2/0.2       -          -  -

0/2/1.1       -          -  -

0/2/1.2       -          -  -

0/3/0         modem-rel  n  S_CONNECT             FXSLS_CONNECT

What's that? "modem-rel"??

And finally it changes again:

ccme#sh voice call summary

PORT           CODEC     VAD VTSP STATE            VPM STATE

============== ========= === ==================== ======================

0/0/0.1       -          -  -

0/0/0.2       -          -  -

0/0/1.1       cisco      n  S_FAX                 S_TSP_CONNECT

0/0/1.2       -          -  -

0/2/0.1       -          -  -

0/2/0.2       -          -  -

0/2/1.1       -          -  -

0/2/1.2       -          -  -

0/3/0         cisco      n  S_FAX                 FXSLS_CONNECT

But there is no "cisco"-codec configured anywhere!

The fax mchines trying to receive but after some time it fails!

Somebody can help?

2 REPLIES 2

Re: FAX at Cisco Unified Communication Express fails

Add this to your configuration:

conf t

no ccm-manager fax protocol cisco

Cisco's proprietary fax protocol is enabled by default.  This will disable it.

FAX at Cisco Unified Communication Express fails

I tried this more than one. After some time it changes to "cisco" again and transfer fails.

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