[Pidgin] #15495: Support incoming DTMF

[Pidgin]

#15495: Support incoming DTMF
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 Reporter:  chemistrydioxide  |      Owner:  Maiku
     Type:  enhancement       |     Status:  new
Milestone:                    |  Component:  Voice and Video
  Version:  2.10.6            |   Keywords:
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 I think it would be useful if Pidgin and libpurple were able to decode
 DTMF tones.

 Possible uses for this feature:

 - libpurple-based interactive voice response systems
 - sending (phone) numbers from PSTN phones to a pidgin client

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Ticket URL: <https://developer.pidgin.im/ticket/15495>
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