UC520 Incoming Fax Problem

Unanswered Question
May 14th, 2010

We have a UC520 connected to a AT&T SIP trunk and have a fax machine connected to one of the FXS ports.  We are able to send faxes but we can't receive faxes.  Here is what I have in the config file:

voice translation-rule 8

rule 1 /0741/ /0741/

!

voice translation-profile Fax_Called_8

translate called 8

!

voice-port 0/0/0

station-id name Fax

station-id number 0741

!

dial-peer cor list call-fax

member PSTN-fax

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

supplementary-service h450.12

no supplementary-service sip moved-temporarily

no supplementary-service sip refer

fax protocol none

no fax-relay sg3-to-g3

sip

  registrar server expires max 3600 min 3600

  no update-callerid

!

dial-peer voice 1 pots

corlist incoming call-fax

description ** CCA Analog Fax **

destination-pattern 0741

port 0/0/0

no sip-register

!

dial-peer voice 3004 voip

description Fax

translation-profile incoming Fax_Called_8

rtp payload-type cisco-codec-fax-ind 98

voice-class sip dtmf-relay force rtp-nte

session protocol sipv2

session target sip-server

incoming called-number 0741

dtmf-relay rtp-nte

ip qos dscp ef signaling

no vad

!

dial-peer voice 1010 voip

corlist outgoing call-fax

description ** Outgoing fax call to SIP trunk **

translation-profile outgoing PSTN_Outgoing

destination-pattern [9]T

rtp payload-type cisco-codec-fax-ind 98

session protocol sipv2

session target sip-server

dtmf-relay rtp-nte

codec g711ulaw

ip qos dscp ef signaling

no vad

!

dial-peer voice 1011 voip

corlist outgoing call-fax

description ** Outgoing fax call to SIP trunk **

translation-profile outgoing PSTN_Outgoing

preference 1

destination-pattern [9]T

rtp payload-type cisco-codec-fax-ind 98

session protocol sipv2

session target ipv4:xx.xxx.xxx.59:5060

dtmf-relay rtp-nte

codec g711ulaw

ip qos dscp ef signaling

no vad

!

dial-peer voice 1110 pots

destination-pattern 0741

port 0/0/0

Can anyone see a problem with this config?

Thanks,

I have this problem too.
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reneten20 Mon, 05/17/2010 - 06:50

When calling the fax number (0741) the following happens:

1. The fax machine answers the call,

2. The fax handshake tone begins and then immediately ends for a second,

3. The fax handshake tone begins again for a 10-15 seconds then

4. The fax machines issues a com error.

I'll remove dial peer 1and see what happens.

Thanks,

reneten20 Thu, 05/20/2010 - 12:19

We took out the dial-peer voice 1 pots  and the result is the same (no inbound fax).  The receiving fax machine states - "no fax detected".  Any other suggestions would be helpful.

Thanks

vcappucc Sun, 05/23/2010 - 17:36

Hi,

Sounds to me that you are having a SIP/2.0 488 isuee, can you please show us the "deb ccsip messages" and "deb ccsip media" when attemping to receive a fax?

To Just give a shoot, I will try the following commands:

en
conf ter
voice service voip
fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw
end
wr

The Syntax: fax protocol {t38 [nse [force]]   [ls-redundancy value [hs-redundancy value]] [fallback {cisco | none | pass-through {g711ulaw | g711alaw}}]} is documented in http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ftsihfax.html#wp1006806


also if the fax rate disable is configured neither the originating nor the terminating gateway can enter into Cisco fax relay mode, T.38 fax relay mode, or fax pass-through mode. The fax rate disable  disables fax transfer support.

thanks,
Victor.-

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