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

[Carter, Bill]

Wireshark capture shows a bad/corrupted packet from the gateway when  
they fail.

No clock slips at all.

I will try turning on redundancy.

The fax server is GFI Faxmaker.

Sent from my iPhone

On May 6, 2010, at 7:05 AM, "Jason Aarons (US)" <jason.aarons at us.didata.com 
 > wrote:

> 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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