[Serusers] use_dns_cache and call forwarding

[caio]

Hi guys,
I have a problem with call forwarding (on busy or not answer).., the
call fall into the failure_route(1) block, and AVP checking and pushto
does its job.

Here a snipped of code of failure_route(1) (flag 27 means call fwd if
no answer):

        if (isflagset(27) && t_check_status("408")) { # if fwd no
answer is set and reply msg is 408

                if (avp_pushto("$ruri", "s:fwdnoanswer")) {
                        avp_delete("s:fwdnoanswer");
                        resetflag(27);

                        avp_print();

                        log(1, "LOG: --> appending new branch...");
                        if (!append_branch()){
                                t_reply("500", "Too many branches?!");
                                drop;
                        }

                        log(1, "LOG: --> Calling route_6...");
                        route(6);
                        break;

Route(6) finally calls route(1), where t_relay is called.
But have a dns failure..and the call never is forwarded.

== ser.log ==

DEBUG: mk_proxy: doing DNS lookup...
get_record: lookup(_sip._udp.wsa.lab, 33) failed_
sip_resolvehost: no SRV record found for wsa.lab, trying 'normal' lookup..._
check_via_address(190.244.33.5, 190.244.33.5, 0)_
ERROR: udp_send: sendto(sock,0x2ab32599c720,910,0,0x2ab325999e68,16):
Operation not permitted(1)_
msg_send: ERROR: udp_send failed_
ERROR: t_forward_nonack: sending request failed_
DEBUG: add_to_tail_of_timer[4]: 0x2ab325999e80_
DEBUG: add_to_tail_of_timer[0]: 0x2ab325999ea0_
ERROR: w_t_relay (failure mode): forwarding failed_

A question regarding this trouble.....Can I disable use_dns_cache ?
SER version is 0.9.7.
What do you recommend?
If you need my ser.cfg I can paste it...

Thanks..

-- 
caio