set perpetual_sound from channel var

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13048 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_conference/mod_conference.c

@@ -4750,6 +4750,10 @@ SWITCH_STANDARD_APP(conference_function)
 			if(switch_strlen_zero(conference->moh_sound)) {
 				conference->moh_sound = switch_core_strdup(conference->pool, switch_channel_get_variable(channel, "conference_moh_sound"));
 			}
+			/* Set perpetual-sound from variable if not set */
+			if(switch_strlen_zero(conference->perpetual_sound)) {
+				conference->perpetual_sound = switch_core_strdup(conference->pool, switch_channel_get_variable(channel, "conference_perpetual_sound"));
+			}
 			
 			/* Set the minimum number of members (once you go above it you cannot go below it) */
 			conference->min = 1;