echo example introduced

test/echo.cfg

@@ -0,0 +1,54 @@
+#
+#
+# $Id$
+#
+# echo: rewrite userpart or r-uri to value from From header field
+#
+
+debug=3         # debug level (cmd line: -dddddddddd)
+fork=no
+log_stderror=yes
+
+memlog=4
+
+check_via=no    # (cmd. line: -v)
+dns=no           # (cmd. line: -r)
+rev_dns=no      # (cmd. line: -R)
+port=5060
+children=4
+fifo="/tmp/ser_fifo"
+
+listen=192.168.2.16
+
+# ------------------ module loading ----------------------------------
+
+# Uncomment this if you want to use SQL database
+#loadmodule "/usr/local/lib/ser/modules/mysql.so"
+
+loadmodule "modules/sl/sl.so"
+loadmodule "modules/exec/exec.so"
+
+route {
+
+		log(1, "request received\n");
+
+		if (method=="REGISTER") {
+			log(1, "register received\n");
+			sl_send_reply("200", "ok happy registratiion");
+			break;
+		};
+
+        if (exec_dset('
+			set -x
+			SIP_UID_FROM=`echo $SIP_HF_FROM | sed -e "s/^.*sip:\([a-zA-Z0-9_\.]*\)@.*$/\1/g"`
+			echo sip:[email protected]
+			echo sip:[email protected]
+			echo>/dev/null ')) {
+                log(1, "trying to rewrite\n");
+				sl_send_reply("300", "redirect");
+        } else {
+                sl_send_reply("500", "exec error");
+                log(1, "alas, rewriting failed\n");
+        };
+}
+