chan_sip: trust_id_outbound CHANGES message improvement

(closes issue AST-1301)

(closes issue ASTERISK-19465)
Reported by: Krzysztof Chmielewski
........

Merged revisions 412821 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@412822 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -17,17 +17,19 @@ chan_sip
  * SIP peers can now specify 'trust_id_outbound' which affects RPID/PAI
    fields for prohibited callingpres information. Values are legacy, no, and
    yes. By default, legacy is used.
-   trust_id_outbound=legacy: behavior remains the same as 1.8.26.1 - When
-   dealing with prohibited callingpres, RPID/PAI headers are created for both
-   sendrpid=pai and sendrpid=rpid are appended, but the data is anonymized.
-   When sendrpid=rpid, only the remote party's domain is anonymized.
-   trust_id_outbound=no: when dealing with prohibited callingpres, RPID/PAI
-   headers are not sent.
-   trust_id_outbound=yes: RPID/PAI headers are applied with the full
-   remote party information in tact even for prohibited callingpres
-   information. In the case of PAI, a Privacy: id header will be appended for
-   prohibited calling information to communicate that the private information
-   should not be relayed to untrusted parties.
+   trust_id_outbound=legacy - behavior remains the same as 1.8.26.1. When
+     dealing with prohibited callingpres and sendrpid=pai/rpid, RPID/PAI
+     headers are appended to outbound SIP messages just as they are with
+     allowed callingpres values, but data about the remote party's identity is
+     anonymized.
+     When sendrpid=rpid, only the remote party's domain is anonymized.
+   trust_id_outbound=no - when dealing with prohibited callingpres, RPID/PAI
+     headers are not sent.
+   trust_id_outbound=yes - RPID/PAI headers are applied with the full remote
+     party information in tact even for prohibited callingpres information.
+     In the case of PAI, a Privacy: id header will be appended for prohibited
+     calling information to communicate that the private information should
+     not be relayed to untrusted parties.
 
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 --- Functionality changes from Asterisk 10 to Asterisk 11 --------------------