[Serusers]Called phone continues ringing when caller hang up (newbie)

[vagabond]

Hi,

I'm running ser-0.8.11 on a Gentoobox.
When phone1 calls phone2 and hangs up when phone2 is ringing phone2
doesn't stop ringing.
If the person who haves phone2 answers before it stops ringing, the
conversation continues with no problem.
The two phones are Zyxel P2000W.

Do you see what is the problem?

Thanks,
Alexandre

My ser.cfg :

debug=3
fork=no
listen=192.168.1.36
log_stderror=yes


check_via=no
dns=no
rev_dns=no
port=5082

fifo="/tmp/ser_fifo"


loadmodule "/usr/lib/ser/modules/sl.so"
loadmodule "/usr/lib/ser/modules/tm.so"
loadmodule "/usr/lib/ser/modules/rr.so"
loadmodule "/usr/lib/ser/modules/maxfwd.so"
loadmodule "/usr/lib/ser/modules/usrloc.so"
loadmodule "/usr/lib/ser/modules/registrar.so"

modparam("usrloc", "db_mode",   0)

modparam("rr", "enable_full_lr", 1)

# -------------------------  request routing logic -------------------

# main routing logic

route{
	if (method=="REGISTER") {
		save("location");
		break;
	};

	if (method=="INVITE") {
		if (uri =~ "sip:1003@*") {
			forward(192.168.1.35, 5060);
			break;
		};

		if (uri =~ "sip:1004@*") {
			forward(192.168.1.37, 5060);
			break;
		};
	};
}