Merge changes from svn/asterisk/team/russell/sla_updates

* Originally, I put in the documentation that only Zap interfaces would be
  supported on the trunk side.  However, after a discussion with Qwell, we came
  up with a way to make IP trunks work as well, using some things already in
  Asterisk.  So, here it is, this now officially supports IP trunks.
* Update the SLA documentation to reflect how to setup IP trunks.
* Add a section in sla.txt that describes how to set up an SLA system with
  voicemail.
* Simplify the way DTMF passthrough is handled in MeetMe.
* Fix a bug that exposed itself when using a Local channel on the trunk side
  in SLA.  The station's channel needs to be passed to the dial API when
  dialing the trunk.
* Change a WARNING message to DEBUG in channel.h.  This message is of no use
  to users.


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@57364 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 137 insertions, 5 deletions

diff --git a/doc/sla.txt b/doc/sla.txt
index 8e9eb2b4c..acb9cb07b 100644
--- a/doc/sla.txt
+++ b/doc/sla.txt
@@ -18,7 +18,10 @@ The SLA implementation can automatically generate the dialplan necessary for
 basic operation if the "autocontext" option is set for trunks and stations in
 sla.conf.  However, for reference, here is an automatically generated dialplan
 to help with custom building of the dialplan to include other features, such as
-voicemail:
+voicemail.
+
+However, note that there is a little bit of additional configuration needed if
+the trunk is an IP channel.  This is discussed in the TRUNKS section.
 
 [line1]
 exten => s,1,SLATrunk(line1)
@@ -49,14 +52,52 @@ exten => station3_line2,1,SLAStation(station3_line2)
 -------------------------------------------------------------------------------
 TRUNKS
 
-For the trunk side of SLA, the only channels that are currently supported are
-Zap channels.  Support for IP trunks is planned, but not yet implemented.
-
 Be sure to configure the trunk's context to be the same one that is set for the
 "autocontext" option in sla.conf if automatic dialplan configuration is used.
+This would be done in the regular device entry in zapata.conf, sip.conf, etc.
+Note that the automatic dialplan generation creates the SLATrunk() extension
+at extension 's'.  This is perfect for Zap channels that are FXO trunks, for
+example.  However, it may not be good enough for an IP trunk, since the call
+coming in over the trunk may specify an actual number.
 
 If the dialplan is being built manually, ensure that calls coming in on a trunk
-execute the SLATrunk() application with an argument of the trunk name.
+execute the SLATrunk() application with an argument of the trunk name, as shown
+in the dialplan example before.
+
+IP trunks can be used, but they require some additional configuration to work.
+
+For this example, let's say we have a SIP trunk called "mytrunk" that is going
+to be used as line4.  Furthermore, when calls come in on this trunk, they are
+going to say that they are calling the number "12564286000".  Also, let's say
+that the numbers that are valid for calling out this trunk are NANP numbers,
+of the form _1NXXNXXXXXX.
+
+In sip.conf,  there would be an entry for [mytrunk].  For [mytrunk], 
+set context=line4.
+
+
+sla.conf:
+
+[line4]
+type=trunk
+device=Local/disa@line4_outbound
+
+
+extensions.conf:
+
+[line4]
+exten => 12564286000,1,SLATrunk(line4)
+
+[line4_outbound]
+exten => disa,1,Disa(no-password|line4_outbound)
+exten => _1NXXNXXXXXX,1,Dial(SIP/${EXTEN}@mytrunk)
+
+
+So, when a station picks up their phone and connects to line 4, they are
+connected to the local dialplan.  The Disa application plays dialtone to the
+phone and collects digits until it matches an extension.  In this case, once
+the phone dials a number like 12565551212, the call will proceed out the
+SIP trunk.
 -------------------------------------------------------------------------------
 
 
@@ -91,3 +132,94 @@ a SIP phone for use with SLA:
       is taken off hook, then the phone should be automatically configured to
       dial "station1" when it is taken off hook.
 -------------------------------------------------------------------------------
+
+
+-------------------------------------------------------------------------------
+VOICEMAIL
+
+This is an example of how you could set up a single voicemail box for the
+phone system.  The voicemail box number used in this example is 1234, which
+would be configured in voicemail.conf.
+
+For this example, assume that there are 2 trunks and 3 stations.  The trunks
+are Zap/1 and Zap/2.  The stations are SIP/station1, SIP/station2, and
+SIP/station3.
+
+In zapata.conf, channel 1 has context=line1 and channel 2 has context=line2.
+
+In sip.conf, all three stations are configured with context=sla_stations.
+
+When the stations pick up their phones to dial, they are allowed to dial
+NANP numbers for outbound calls, or 8500 for checking voicemail.
+
+
+sla.conf:
+
+[line1]
+type=trunk
+device=Local/disa@line1_outbound
+
+[line2]
+type=trunk
+device=Local/disa@line2_outbound
+
+[station](!)
+type=station
+trunk=line1
+trunk=line2
+
+[station1](station)
+device=SIP/station1
+
+[station2](station)
+device=SIP/station2
+
+[station3](station)
+device=SIP/station3
+
+
+extensions.conf:
+
+[macro-slaline]
+exten => s,1,SLATrunk(${ARG1})
+exten => s,n,Goto(s-${SLATRUNK_STATUS}|1)
+exten => s-FAILURE,1,Voicemail(1234|u)
+exten => s-UNANSWERED,1,Voicemail(1234|u)
+
+[line1]
+exten => s,1,Macro(slaline|line1)
+
+[line2]
+exten => s,2,Macro(slaline|line2)
+
+[line1_outbound]
+exten => disa,1,Disa(no-password|line1_outbound)
+exten => _1NXXNXXXXXX,1,Dial(Zap/1/${EXTEN})
+exten => 8500,1,VoicemailMain(1234)
+
+[line2_outbound]
+exten => disa,1,Disa(no-password|line2_outbound)
+exten => _1NXXNXXXXXX,1,Dial(Zap/2/${EXTEN})
+exten => 8500,1,VoicemailMain(1234)
+
+[sla_stations]
+
+exten => station1,1,SLAStation(station1)
+exten => station1_line1,hint,SLA:station1_line1
+exten => station1_line1,1,SLAStation(station1_line1)
+exten => station1_line2,hint,SLA:station1_line2
+exten => station1_line2,1,SLAStation(station1_line2)
+
+exten => station2,1,SLAStation(station2)
+exten => station2_line1,hint,SLA:station2_line1
+exten => station2_line1,1,SLAStation(station2_line1)
+exten => station2_line2,hint,SLA:station2_line2
+exten => station2_line2,1,SLAStation(station2_line2)
+
+exten => station3,1,SLAStation(station3)
+exten => station3_line1,hint,SLA:station3_line1
+exten => station3_line1,1,SLAStation(station3_line1)
+exten => station3_line2,hint,SLA:station3_line2
+exten => station3_line2,1,SLAStation(station3_line2)
+
+-------------------------------------------------------------------------------