[Asterisk-code-review] res_pjsip_aoc: New module for sending advice-of-charge with chan_pjsip (asterisk[master])

[Michael Kuron]

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Change subject: res_pjsip_aoc: New module for sending advice-of-charge with chan_pjsip
......................................................................

res_pjsip_aoc: New module for sending advice-of-charge with chan_pjsip

chan_sip supported sending AOC-D and AOC-E information in SIP INFO
messages in an "AOC" header in a format that was originally defined by
Snom. In the meantime, ETSI TS 124 647 introduced an XML-based AOC
format that is supported by devices from multiple vendors, including
Snom phones with firmware >= 8.4.2 (released in 2010).

This commit adds a callback hook for AOC indications to chan_pjsip. It
also adds a new res_pjsip_aoc module that inserts AOC information into
outgoing messages or sends SIP INFO messages as follows:

* AOC-S in the 180/183/200 responses to an INVITE request
* AOC-S in SIP INFO (if a 200 response has already been sent)
* AOC-D in SIP INFO
* AOC-E in the 200 response to a BYE request (if the client hangs up)
* AOC-E in a BYE request (if Asterisk hangs up)

The SIP INFO requests are sent out immediately when the AOC indication
is received. The others are inserted into an appropriate outgoing
message whenever that is ready to be sent. In the latter case, the XML
is stored in a channel variable at the time the AOC indication is
received. Depending on where the AOC indications are coming from (e.g.
PRI or AMI), it may not always be possible to guarantee that the AOC-E
is available in time for the BYE.

Successfully tested AOC-D and both variants of AOC-E with a Snom D735
running firmware 10.1.127.10. It does not appear to properly support
AOC-S however, so that could only be tested by inspecting SIP traces.

ASTERISK-21502 #close
Reported-by: Matt Jordan <mjordan at digium.com>

Change-Id: Iebb7ad0d5f88526bc6629d3a1f9f11665434d333
---
M channels/chan_pjsip.c
M include/asterisk/res_pjsip.h
M res/res_pjsip.c
A res/res_pjsip_aoc.c
4 files changed, 694 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/60/19460/2
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Change-Id: Iebb7ad0d5f88526bc6629d3a1f9f11665434d333
Gerrit-Change-Number: 19460
Gerrit-PatchSet: 2
Gerrit-Owner: Michael Kuron <m.kuron at gmx.de>
Gerrit-Reviewer: Friendly Automation
Gerrit-Attention: Michael Kuron <m.kuron at gmx.de>
Gerrit-MessageType: newpatchset
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