How to do T.37 fax on ramp from SIP T.38

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Jul 1st, 2010
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We are wanting to use the T.37 fax on ramp solution on a Cisco 3662 with the calls coming in as SIP using T.38.  We are not able to get this operational.  Is this work flow supported or is on ramp only usable from POTS?

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Edson Pineiro Thu, 07/01/2010 - 21:15
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Unfortunately on ramp will only work if the incoming dial-peer matched is a pots dial-peer, due to limitations in the tcl script. what you can do however is use an FXS port back to back to an FXO port. However this will limit the amount of t37 sessions based on the amount of ports you have connected back to back.

I hope this helps.


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