Vic3-2FXS/DID fax problem

I have a network in Beijing China below,
(1) E1 Pri interface to PSTN
(2) Vic3-2FXS/DID to fax machine
all these modules installed on Cisco 2900, when I call my fax machine from PSTN, the fax machine answered, but fax can't start.
I want to know is there any special consideration about the fax configuration to be worked.
Thanks for your advice.
Robert
2011/2/18

Hey Robert.
Since you have PRI and the fxs port on the same card, in theory there is not a whole lot you need to do with regards to the fax or port configuration on the router if this is H323 or SIP. On our initial voip gateways even on port to port calls we would invoke fax relay, but on the ISR line with the internal tdm backplane, the dsp should be dropped from the call with minimal impairment of the connection through the gateway.
Now, this is true as long as you don't have "no local-bypass' configured under the voice-card. Default is that this is not configured but it you do, you should change it to local-bypass. "show voice dsp active" will show if the dsp is still in the loop on the call as well.
Definitely check the E1 controller ("show controller e1") for slips and errors. This will kill a fax if present.
Looking back at your previous post though, I would not expect you to be seeing G722 on the output of the show voice call summary when the call connects between the two ports.
Are you using MGCP?
When the call is active between the two ports, what is the output of "show call active voice brief" and "show call active fax brief"?
There are a few good resources for troubleshooting fax issues. An excellent source if the CiscoPress publication "Fax, Modem and Text for IP Telephony". If you would like some of the scaled down versions, I have posted a couple of links that would be useful.
Bryan
https://supportforums.cisco.com/community/netpro/collaboration-voice-video/ip-telephony/blog/2010/10/26/fax-configuration-and-troubleshooting-project
http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/voice_troubleshooting/old/vts_fax.html

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If you have copper pairs to connect, yes.<-- means that if we connect the faxs to a switch and the VIC3-2FXS/DID to the other switch with Ethernet cable it will work?
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Hi John,
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Ok
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Hi Team,
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VIC3-4FXO card is not supported in 2801 according to table4
Table 4. Software and Memory Requirements for Voice/Fax Network Modules and Voice Interface Cards
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Cisco 2800 Series
Cisco 3800 Series
Cisco 2900 and 3900 Series
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NM-HD-2V
NM-HD-2VE
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VIC2-4FXO
VIC2-2BRI-NT/TE
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• Release 12.3(8)T4
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• Cisco IOS Software
• Release 12.3(11)T
• "IP Voice" images
• Cisco IOS Software Release 15.0(1)M
• "UC Technology" images
VWIC2-xMFT-xx
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VIC3-2FXS-E/DID
VIC3-4FXS/DID
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• "IP Voice" images
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• "IP Voice" images
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Hi @ColtraneII,
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Go to the wrench icon/fax setup /advanced setup/fax speed/change it to medium.
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Thank You.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
I work on behalf of HP

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I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

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Hi,
I have the 2801 router with a VIC3-2FXS card that is not detecting, I see it with sh diag command like Unkown WAN card.
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Thank you by your support.
Do you know If I can use next IOS:
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I have 34 locations
30 locations have 2 analog devices
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HI,
Disconnect all cables and connect directly to a different wall outlet and try again.
Although I am an HP employee, I am speaking for myself and not for HP.
--Say "Thanks" by clicking the Kudos Star in the post that helped you.
--Please mark the post that solves your problem as "Accepted Solution"

Vic3-2FXS/DID fax problem

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