DTMF Issue

[drifter56]

We have a fax serve on site used for outgoing faxes only and is connected to the pbx with several analog ports. Recently we stated getting complaints from a private individual that they are receiving fax calls from us on their cell phone. I was able to use CDR data to track the outgoing call to the fax server and verified the cdr data says we sent the call to the wrong number, of course the vendor has logs showing they dialed the correct number. I have moved the port that seems to have the most trouble to a new 500 card and the vendor is sending out a new modem so we will see. I know when the modem dials the number it is producing the tones locally but what I can't remember is which card in the pbx is actually interpretting the tones, the 500 card, dtr or tds? Thanks for any thoughts you might have.

 

[GHTROUT]

The DTR waits for and hears the analog TN's DTMF. The TDS sends the digits out, until the EOD timer is reached.

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[drifter56]

GHTROUT, Thanks for the reply as the calls go out a PRI to the far end fax machine, seems if there is an issue with the pbx most likely the dtr.

 

[PERRYPJ]

If you are using a ISDN-PRI there is no DTMF involved, the sent digits are sent by the DCH. DTMF has nothing to do with it.

OLD ROLMEN WORKING ON NORTELS AND AVAYA

 

[drifter56]

PERRYPJ, thanks you are correct but the digits have to be decoded by the pbx first then the processor sends the call out the PRI via the d channel. As there are only two dtr's in the system if this becomes a finger pointing contest it will be easier and quicker to change them and push it back to the vendor.