Subject: [Perc] DTMF in Double

From: Cullen Jennings <[email-masked]>
Date: Sun, 13 Aug 2017 13:22:30 -0700

I think Roni had a good point about DTMF can be done with the SIP INFO approach so I plan to add the text do double that says something along the lines of 

   When DTMF is sent with [RFC4733], it is end-to-end encrypted and the
   relay can not read it so it can not be used to control the media
   relay.  Other out of band methods to control the relay need to can
   be used instead.  One way to do this is to send DTMF with [RFC6086],
   which will be sent in the signalling thus allowing the relay to read
   the DTMF.