changed vm module name from 'voicemail' to 'vm' to avoid confusion.

examples/voicemail.cfg

@@ -31,7 +31,7 @@ loadmodule "/home/srouter/sip_router/modules/vm/vm.so"
 	    
 # ----------------- setting module-specific parameters ---------------
 
-modparam("voicemail", "db_url","mysql://ser:heslo@dbhost/ser")
+modparam("vm", "db_url","mysql://ser:heslo@dbhost/ser")
 
 # -------------------------  request routing logic -------------------