[asterisk-dev] [Code Review] Add replacement for SIP_CAUSE

opticron reviewboard at asterisk.org
Thu May 3 13:49:37 CDT 2012

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(Updated May 3, 2012, 1:49 p.m.)

Review request for Asterisk Developers.


Comments from mmichelson addressed.


Add HANGUPCAUSE as a more generic mechanism for reporting the type of information available in SIP_CAUSE as well as a drop-in replacement for SIP_CAUSE that does not incur the overhead of the MASTER_CHANNEL dialplan function.  This feature uses control frames to pass the data and creates a mechanism by which any channel driver can report cause information.  This implementation includes only SIP, but implementations for other channel drivers will be available in the future.

This addresses bug SWP-4221.

Diffs (updated)

  trunk/UPGRADE.txt 365212 
  trunk/apps/app_dial.c 365212 
  trunk/apps/app_followme.c 365212 
  trunk/apps/app_queue.c 365212 
  trunk/channels/chan_alsa.c 365212 
  trunk/channels/chan_console.c 365212 
  trunk/channels/chan_gtalk.c 365212 
  trunk/channels/chan_h323.c 365212 
  trunk/channels/chan_iax2.c 365212 
  trunk/channels/chan_jingle.c 365212 
  trunk/channels/chan_mgcp.c 365212 
  trunk/channels/chan_misdn.c 365212 
  trunk/channels/chan_oss.c 365212 
  trunk/channels/chan_phone.c 365212 
  trunk/channels/chan_sip.c 365212 
  trunk/channels/chan_skinny.c 365212 
  trunk/channels/chan_unistim.c 365212 
  trunk/channels/chan_vpb.cc 365212 
  trunk/configs/sip.conf.sample 365212 
  trunk/funcs/func_frame_trace.c 365212 
  trunk/include/asterisk/frame.h 365212 
  trunk/main/channel.c 365212 
  trunk/main/dial.c 365212 
  trunk/main/features.c 365212 
  trunk/main/file.c 365212 
  trunk/main/rtp_engine.c 365212 

Diff: https://reviewboard.asterisk.org/r/1822/diff


Verified that this functions identically to SIP_CAUSE in single-channel dials, forked dials, and forked dials behind a local dial.

Sample dialplan:
exten => s,1,Dial(SIP/bar)
exten => h,1,noop()
; start loop
exten => h,n(begin),noop()
; check exit condition (no more array to check)
exten => h,n,gotoif($[${LEN(${HANGUPCAUSE_STRING})} = 0]?exit)
; pull the next item
exten => h,n,set(ARRAY(item)=${HANGUPCAUSE_STRING})
exten => h,n,set(HANGUPCAUSE_STRING=${HANGUPCAUSE_STRING:${LEN(${item})}})
; display the channel ID and cause code
exten => h,n,noop(got channel ID ${item} with pvt cause ${HASH(HANGUPCAUSE,${item})})
; check exit condition (no more array to check)
exten => h,n,gotoif($[${LEN(${HANGUPCAUSE_STRING})} = 0]?exit)
; we still have entries to process, so strip the leading comma
; go back to the beginning of the loop
exten => h,n,goto(begin)
exten => h,n(exit),noop(All HANGUPCAUSE entries processed)



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