add freeswitch

Change-Id: If948de9e9e7e288b0a031ab973f453cd91a9e99b
diff --git a/net/config_2g3g b/net/config_2g3g
index 0ef2e76..b3f0264 100644
--- a/net/config_2g3g
+++ b/net/config_2g3g
@@ -110,6 +110,11 @@
 SIPCON_LOCAL_PORT="5060"
 SIPCON_REMOTE="127.0.0.1"
 SIPCON_REMOTE_PORT="5069"
+# SIPCON_SERVER:
+#  "kamailio" -- launch kamailio
+#  "freeswitch" -- launch freeswitch
+#  "none" -- launch no server, use remotely running SIP server
+SIPCON_SERVER="kamailio"
 
 LOG_OUTPUT0_TYPE=stderr
 LOG_OUTPUT1_TYPE=file current_log/${_name}.log