[cisco-voip] Dialogic SR140 T38 fax to 2921 vg problems

[Jason Aarons (US)]

On the SR140 I would install Wireshark and watch the H.323/T.30 exchange try to see what happens when it fails. Also what does Captaris Enterprise Fax Manager show on that Channel?

You could also enable T.38 packet redundancy on both sides.

Are you having any clocking/slips on the PRI side?  show network-clock, show controller t1

________________________________________
From: cisco-voip-bounces at puck.nether.net [cisco-voip-bounces at puck.nether.net] On Behalf Of Carter, Bill [bcarter at sentinel.com]
Sent: Wednesday, May 05, 2010 8:37 PM
To: Cisco-Voip-Puck
Subject: Re: [cisco-voip] Dialogic SR140 T38 fax to 2921 vg problems

Sorry about that. accidentally hit send. I'll start over.

We have a fax server using the Dialogic SR140 software for fax over
IP.  The fax server is local to the voice gateway.

About 100 outbound faxes are sent 2x a day.

The gateway is a Cisco 2921 GSR2 with IOS 15.0(1)M2.  PSTN is PRI

The gateway is configured with:
voice service voip
 fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none
!
dial-peer voice 1 voip
 ...
fax-relay sg3-to-g3
fax nsf 000000
!
dial-peer voice 100 pots
 preference 1
 destination-pattern 81[2-9]..[2-9]......
 incoming called-number .
 direct-inward-dial
 port 0/0/1:23
 forward-digits 11

When voip dial-peers are configured with:
no fax-relay ECM disable

75% off outbound faxes fail. the 25% that succeed have very distorted/illegible pages. The test fax is a single page with every line repeating the word "test". These successful faxes have distorted text across the top 1/4 of the page.

When fax-relay ECM is enabled and fax rate is set to 9600, outbound success rates improve marginally. Text on the successful fax fills 100% of the page with zero distortion.

Any ideas?

~*~*~*~*~*~*~*~*~*~*
Bill Carter
Senior Business Communications Analyst
CCIE 5022
Sentinel Technologies
SNR 217.391.5015
~*~*~*~*~*~*~*~*~*~*



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