Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 166901)
+++ channels/chan_sip.c	(working copy)
@@ -14769,6 +14769,17 @@
 
 	ast_set_flag(&transferer->flags[0], SIP_DEFER_BYE_ON_TRANSFER);	/* Delay hangup */
 
+	/* If we are performing an attended transfer and we have two channels involved then copy sound file information to play upon attended transfer completion */ 
+	if (target.chan2) { 
+		const char *chan1_attended_sound = pbx_builtin_getvar_helper(target.chan1, "ATTENDED_TRANSFER_COMPLETE_SOUND"), *chan2_attended_sound = pbx_builtin_getvar_helper(target.chan2, "ATTENDED_TRANSFER_COMPLETE_SOUND"); 
+		if (!ast_strlen_zero(chan1_attended_sound)) { 
+			pbx_builtin_setvar_helper(target.chan1, "BRIDGE_PLAY_SOUND", chan1_attended_sound); 
+		} 
+		if (!ast_strlen_zero(chan2_attended_sound)) { 
+			pbx_builtin_setvar_helper(target.chan2, "BRIDGE_PLAY_SOUND", chan2_attended_sound); 
+		} 
+	} 
+
 	/* Perform the transfer */
 	res = attempt_transfer(current, &target);
 	ast_mutex_unlock(&targetcall_pvt->lock);
Index: main/channel.c
===================================================================
--- main/channel.c	(revision 166901)
+++ main/channel.c	(working copy)
@@ -4124,6 +4124,7 @@
 	for (/* ever */;;) {
 		struct timeval now = { 0, };
 		int to;
+		const char *bridge_play_sound = NULL;
 
 		to = -1;
 
@@ -4206,6 +4207,16 @@
 		if (!ast_strlen_zero(pbx_builtin_getvar_helper(c1, "BRIDGEPEER")))
 			pbx_builtin_setvar_helper(c1, "BRIDGEPEER", c0->name);
 		
+		/* See if we need to play an audio file to any side of the bridge */ 
+		if ((bridge_play_sound = pbx_builtin_getvar_helper(c0, "BRIDGE_PLAY_SOUND"))) { 
+			bridge_playfile(c0, c1, bridge_play_sound, 0); 
+			pbx_builtin_setvar_helper(c0, "BRIDGE_PLAY_SOUND", NULL); 
+		} 
+		if ((bridge_play_sound = pbx_builtin_getvar_helper(c1, "BRIDGE_PLAY_SOUND"))) { 
+			bridge_playfile(c1, c0, bridge_play_sound, 0); 
+			pbx_builtin_setvar_helper(c1, "BRIDGE_PLAY_SOUND", NULL); 
+			} 
+
 		if (c0->tech->bridge &&
 		    (config->timelimit == 0) &&
 		    (c0->tech->bridge == c1->tech->bridge) &&
Index: configs/sip.conf.sample
===================================================================
--- configs/sip.conf.sample	(revision 166901)
+++ configs/sip.conf.sample	(working copy)
@@ -672,6 +672,9 @@
 ;username=goran                 ; Username to use when calling this device before registration
                                 ; Normally you do NOT need to set this parameter
 ;setvar=CUSTID=5678             ; Channel variable to be set for all calls from this device
+;setvar=ATTENDED_TRANSFER_COMPLETE_SOUND=beep ; This channel variable will caus
+e the given audio file to be played
+                                ; upon completion of an attended transfer
 
 ;[pre14-asterisk]
 ;type=friend