Clarify some settings for status reports in subscriptions, queues and manager

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48114 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/sip.conf.sample

@@ -174,6 +174,15 @@ srvlookup=yes			; Enable DNS SRV lookups on outbound calls
 ; You can subscribe to the status of extensions with a "hint" priority
 ; (See extensions.conf.sample for examples)
 ; chan_sip support two major formats for notifications: dialog-info and SIMPLE 
+;
+; You will get more detailed reports (busy etc) if you have a call limit set
+; for a device. When the call limit is filled, we will indicate busy. Note that
+; you need at least 2 in order to be able to do attended transfers.
+;
+; For queues, you will need this level of detail in status reporting, regardless
+; if you use SIP subscriptions. Queues and manager use the same internal interface
+; for reading status information.
+;
 ; Note: Subscriptions does not work if you have a realtime dialplan and use the
 ; realtime switch.
 ;