Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

IAD2431 TDM Fax Help

I am having a problem with the IAD2431 and what seems some basic TDM switching. We have an AS5400 gateway connecting to the IAD2431 via a standard PRI. The AS5400 has 4 PRI's to the LEC as well. All voice calls are working great. The issue we are having is when sending or receiving any fax calls, they fax machines (tried 3 different ones on 2 difference lines) all get "Line Errors". We have enabled the "fax send max-speed 9600" option but that has not made any difference. I have attached any relivant configuration. We are running IOS Version 12.4(9)T1. At this point, with general tdm switching, i am not sure what to look at or debug. Any help would be appreciated.

Thanks in advance.

New Member

Re: IAD2431 TDM Fax Help

Verify that the signalling on the FXS is either fxo-loop-start or ground-start signalling.

This URL should help you:

Configuring Cisco Fax Relay :

Hall of Fame Super Gold

Re: IAD2431 TDM Fax Help

If you call the fax from outside, can you hear the tones level same as when calling any other fax ? Also try "no vad" and "no echo-cancel enable" under the analog voice-ports.