[cisco-voip] CUCM 10.x and RightFax SR140 v10

[Daniel Pagan]

That “pre-tone” you’re referring to is called the CNG tone, assuming you hear it every 3 seconds on your calling fax machine. It’s basically what tells the remote end “I’m a fax machine” but many devices no long wait to hear this before attempting to start negotiating capabilities. However, it seems like these few destinations you’re having issues with do in fact rely on the CNG tone before sending its CED and DIS.

I don’t have a ton of experience administering RightFax, but in my experience with FoIP on Cisco platforms, there’s no way to inject the CNG tone. Are you sure the RightFax server isn’t playing the CNG tone? You won’t be able to hear it unless you either:


1.       Call yourself from the RF server, answer, and listen… or…

2.       Pull a pcap for the RTP media streamed from the RF server.

- Dan

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Countryman, Edward
Sent: Tuesday, August 18, 2015 1:52 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] CUCM 10.x and RightFax SR140 v10

We’ve gone live with the new RF SR140 F0Ip environment a couple of months ago.  For the most part, things are working great.

There are a couple of destinations however that we don’t seem to be able to successfully send to, even though I can send from the standalone fax machine in my office every time.

One difference we noted was that my standalone fax machine starts to beep immediately after dialing and even before the remote end answers.  The RF SR140 doesn’t do this.  Without this beeping the remote side seems to not want to talk to us.

Does anyone know what this pre-tone is called and if it can be enabled in the RF 10.x ??


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