[OpenSER-Users] "max_contacts", 1 and EI_R_TOO_MANY

In OpenSER 1.2.0 EI_R_TOO_MANY has been defined by default as "Too many registered contacts" in modules/registrar/reply.c. This message is quite enough for me, but in which occations does UA get this message? I have modparam("registrar", "max_contacts", 1) in my configuration and every time I try to register another client with a username that allready has an AOR in locations table, I get response "503 Service Unavailable", not "503 Too many registered contacts". How should I modify reply.c to get "Too many registered contacts" when I have, well, too many registered contacts? I found this thread from the mailinglist http://www.mail-archive.com/users@openser.org/msg10796.html, but I do not think it really helps me, because the value of EI_R_TOO_MANY does not seem to effect the the response the second UA gets from the OpenSER. thank you JN