Adds immediate yes/no option to iax.conf

This is very similar to the DAHDI immediate=yes option.  When the phone is picked up, instead of giving a dialtone it connects directly to the "s" extension.  Changes where implemented in chan_iax2.c to directly connect to the "s" extension in the appropriate context when this option is enabled.  Examples explaining its use are added to iax2.conf.sample.  CHANGES has been updated as well. 

(closes issue #14266)
Reported by: jcovert
Patches:
      chan_iax2.c.patch-trunk uploaded by jcovert (license 551)
      iax.conf.sample.patch uploaded by jcovert (license 551)
Tested by: jcovert, dvossel
Review: http://reviewboard.digium.com/r/143/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@174046 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -545,6 +545,7 @@ IAX2 changes
   * Added the srvlookup option to iax.conf
   * Added support for OSP.  The token is set and retrieved through the CHANNEL()
      dialplan function.
+  * Added immediate option to iax.conf
 
 XMPP Google Talk/Jingle changes
 -------------------------------

channels/chan_iax2.c

@@ -376,6 +376,7 @@ enum iax2_flags {
 						     them before sending voice or anything else*/
 	IAX_ALLOWFWDOWNLOAD =   (1 << 26),	/*!< Allow the FWDOWNL command? */
 	IAX_NOKEYROTATE =       (1 << 27),	/*!< Disable key rotation with encryption */
+	IAX_IMMEDIATE =		(1 << 28),      /*!< Allow immediate off-hook to extension s */
 };
 
 static int global_rtautoclear = 120;
@@ -6221,6 +6222,7 @@ static int check_access(int callno, struct sockaddr_in *sin, struct iax_ies *ies
 			ast_set_flag(iaxs[callno], IAX_MAXAUTHREQ);
 		iaxs[callno]->prefs = user->prefs;
 		ast_copy_flags(iaxs[callno], user, IAX_CODEC_USER_FIRST);
+		ast_copy_flags(iaxs[callno], user, IAX_IMMEDIATE);
 		ast_copy_flags(iaxs[callno], user, IAX_CODEC_NOPREFS);
 		ast_copy_flags(iaxs[callno], user, IAX_CODEC_NOCAP);
 		ast_copy_flags(iaxs[callno], user, IAX_NOKEYROTATE);
@@ -9465,11 +9467,15 @@ retryowner2:
 							ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
 							/* If this is a TBD call, we're ready but now what...  */
 							ast_verb(3, "Accepted AUTHENTICATED TBD call from %s\n", ast_inet_ntoa(sin.sin_addr));
+							if (ast_test_flag(iaxs[fr->callno], IAX_IMMEDIATE)) {
+								goto immediatedial;
+							}
 						}
 					}
 				}
 				break;
 			case IAX_COMMAND_DIAL:
+immediatedial:
 				if (ast_test_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD)) {
 					ast_clear_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
 					ast_string_field_set(iaxs[fr->callno], exten, ies.called_number ? ies.called_number : "s");
@@ -10984,6 +10990,8 @@ static struct iax2_user *build_user(const char *name, struct ast_variable *v, st
 					ast_set_flag(user, IAX_CODEC_NOCAP);
 					ast_set_flag(user, IAX_CODEC_NOPREFS);
 				}
+			} else if (!strcasecmp(v->name, "immediate")) {
+				ast_set2_flag(user, ast_true(v->value), IAX_IMMEDIATE);
 			} else if (!strcasecmp(v->name, "jitterbuffer")) {
 				ast_set2_flag(user, ast_true(v->value), IAX_USEJITTERBUF);
 			} else if (!strcasecmp(v->name, "forcejitterbuffer")) {

configs/iax.conf.sample

@@ -469,3 +469,15 @@ host=216.207.245.47
 ;context=default
 ;permit=0.0.0.0/0.0.0.0
 
+;
+; With immediate=yes, an IAX phone or a phone on an IAXy acts as a hot-line
+; which goes immediately to the s extension when picked up.  Useful for
+; elevator phones, manual service, or other similar applications.
+;
+;[manual]
+;type=friend
+;host=dynamic
+;immediate=yes  ; go immediately to s extension when picked up
+;secret=moofoo	; when immediate=yes is specified, secret is required
+;context=number-please ; we start at the s extension in this context
+;