add "rtp_interface" preference

db_scripts/diff/15139.up

@@ -0,0 +1,8 @@
+use provisioning;
+set autocommit=0;
+
+insert into voip_preferences values (null, 5, 'rtp_interface', 'RTP interface', 0, 1, 1, 0, 1, 1, 0, now(), 0, 0, 'enum', 0, 'Logical RTP interface to use for media packets');
+select last_insert_id() into @ins_id;
+insert into voip_preferences_enum values (null, @ins_id, 'default', null, 1, 1, 1, 1, null, 1);
+
+commit;