use macros for udp raw sockets

kamailio/defs.cfg

@@ -91,6 +91,9 @@ kazoo.to_external_no_response_18X_timer = INTERNAL_TO_EXTERNAL_NO_RESPONSE_18X_T
 #!trydef TCP_KEEP_INTERVAL 30
 #!trydef TCP_SEND_TIMEOUT 3
 
+#!trydef KZ_UDP_RAW 0
+#!trydef KZ_UDP_RAW_MTU 1500
+
 #!include_file "defs-amqp.cfg"
 
 #!ifndef MEDIA_SERVERS_HASH_SIZE

kamailio/globals.cfg

@@ -69,11 +69,8 @@ tcp_wq_blk_size = 2100
 tcp_wq_max = 10485760
 
 ####### UDP Parameters #########
-udp4_raw = 0
-#udp4_raw_mtu = 800
-# # pmtu_discovery = no
-#udp_mtu = 800
-# #udp_mtu_try_proto = TCP
+udp4_raw = KZ_UDP_RAW
+udp4_raw_mtu = KZ_UDP_RAW_MTU
 
 ####### DNS Parameters #########
 dns = no