[Pidgin] #16305: Play sound on incoming call (ring tone)

[Pidgin]

#16305: Play sound on incoming call (ring tone)
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 Reporter:  poorman  |      Owner:  EionRobb
     Type:  patch    |     Status:  new
Milestone:           |  Component:  unclassified
  Version:  2.10.9   |   Keywords:  ring ringtone
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 Hello folks,

 I'm attaching simple patch, which will play sound event on incoming call.
 It uses the pidgin/libpurple standard way of playing sound events, i.e.
 sound is played just once and it is not terminated after call is answered.

 By default alert.wav is used, but user is free to change his ring tone by
 standard means in Pidgin configuration
 (Tools->Preferences->Sounds->Incoming call). This sound event is enabled
 by default. I personally use real phone ring sound with reasonable length,
 so it gets my attention, but it finishes before the call is answered.

 There is an improvement ticket for this feature:
 https://developer.pidgin.im/ticket/15713

 Cheers,
 poorman

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Ticket URL: <https://developer.pidgin.im/ticket/16305>
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