use of listen to advertise IP in Via (as opposed to DNS names)

iptel.cfg

@@ -13,6 +13,11 @@ dns=on           # (cmd. line: -r)
 rev_dns=yes      # (cmd. line: -R)
 port=5040
 
+# advertise IP address in Via (as opposed to advertising DNS name
+# which is annoying for downstream servers and some phones can
+# not handle DNS at all)
+listen=195.37.77.101
+
 loadmodule "modules/sl/sl.so"
 loadmodule "modules/print/print.so"
 loadmodule "modules/tm/tm.so"