[Pidgin] #12617: Patch to add out-of-band DTMF support

[Pidgin]

#12617: Patch to add out-of-band DTMF support
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 Reporter:  BigBrownChunx           |       Owner:  darkrain42
     Type:  patch                   |      Status:  new
Milestone:  Patches Needing Review  |   Component:  libpurple
  Version:  2.7.3                   |  Resolution:
 Keywords:  dtmf media              |
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Comment (by David Woodhouse <David.Woodhouse@…>):

 (In [e4c122196b08]):[[BR]]
 Add out-of-band DTMF support and dialpad to use it

 This resolves the non-Jabber-specific part of ticket 12617, by adding
 purple_media_send_dtmf(), and a corresponding method to the
 PurpleMediaBackendIface and the farstream implementation thereof.

 Fixes #15575
 Refs #12617

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Ticket URL: <https://developer.pidgin.im/ticket/12617#comment:21>
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