[Pidgin] #5886: SIP/SIMPLE improvements from Chris Brody

[Pidgin]

#5886: SIP/SIMPLE improvements from Chris Brody
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 Reporter:  MarkDoliner  |       Owner:  seanegan
     Type:  patch        |      Status:  new     
 Priority:  minor        |   Milestone:          
Component:  SIMPLE       |     Version:  2.4.2   
 Keywords:               |     Pending:  0       
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 This patch is from Chris Brody (cbrody att stanfordalumni dott org).  The
 patch was made against 2.0.0 beta 7.  "In general, most of these changes
 are not elegant, to say the least."

  1. Abbreviated headers: not elegant, but worked with the Siemens switch.
 They had options: to send abbreviated headers and accept either normal or
 abbreviated headers, or only send & accept abbreviated headers.
  2. Authentication fixes: using a bogus cnonce for Digest auth, use
 auth->digest_session_key, elementary support for QOP & opaque parameters,
 support for nextnonce parameter, using Authorization & Proxy-Authorization
 with auth_uri in a number of messages, support for header Authentication-
 Info with nextnonce, small retries fix.
  3. Experimental PIDFs-I believe I did not have real success and you can
 ignore them.
  4. Adding "," for multiple Accept headers in process_incoming_subscribe
  5. Hard-coded change to resend_timeout, should be configured.
  6. Commented out simple_typing callback for message-caused problems with
 our system-should be configured.

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Ticket URL: <http://developer.pidgin.im/ticket/5886>
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