[Serusers] fifo UAC completed with status 408

I am behind a firewall that [ports bookseller. I use the serweb for neviar a mensage to an user and it leaves an error: 408 Request Timeout. and in the log it leaves this. 9(4027) fifo_get_method: method: 'MESSAGE' 9(4027) DEBUG: fifo_get_ruri: 'sip:walter@cwafrica.com.pe' 9(4027) DEBUG: fifo_get_nexthop: next hop empty 9(4027) fifo_get_headers: headers: From: sip:rbolivar@cwafrica.com.pe To: <sip:walter@cwafrica.com.pe> p-version: Web_interface_Karel_Kozlik-0.9 Contact: <sip:daemon@cwafrica.com.pe> Content-Type: text/plain; charset=UTF-8 9(4027) parse_headers: flags=-1 9(4027) end of header reached, state=9 9(4027) DEBUG: get_hdr_field: <To> [30]; uri=[sip:walter@cwafrica.com.pe] 9(4027) DEBUG: to body [<sip:walter@cwafrica.com.pe> ] 9(4027) DEBUG: fifo_uac: parse_headers succeeded 9(4027) fifo_get_body: body: sdas 9(4027) end of header reached, state=8 9(4027) DEBUG: get_hf_block: one more hf processed 9(4027) DEBUG: get_hf_block: one more hf processed 9(4027) DEBUG: get_hf_block: one more hf processed 9(4027) DEBUG: fifo_uac: EoL -- proceeding to transaction creation 9(4027) DEBUG: mk_proxy: doing DNS lookup... 9(4027) get_record: lookup(_sip._udp.cwafrica.com.pe, 33) failed 9(4027) sip_resolvehost: no SRV record found for cwafrica.com.pe, trying 'normal' lookup... 9(4027) DEBUG: dlg2hash: 23003 9(4027) DEBUG: add_to_tail_of_timer[4]: 0x2ad72a80 9(4027) DEBUG: add_to_tail_of_timer[0]: 0x2ad72a94 9(4027) INFO: fifo_server: command empty 10(4052) DEBUG: timer routine:4,tl=0x2ad72a80 next=(nil) 10(4052) DEBUG: retransmission_handler : request resending (t=0x2ad72970, MESSAGE s ... ) 10(4052) DEBUG: add_to_tail_of_timer[5]: 0x2ad72a80 10(4052) DEBUG: retransmission_handler : done 10(4052) DEBUG: timer routine:5,tl=0x2ad72a80 next=(nil) 10(4052) DEBUG: retransmission_handler : request resending (t=0x2ad72970, MESSAGE s ... ) 10(4052) DEBUG: add_to_tail_of_timer[6]: 0x2ad72a80 10(4052) DEBUG: retransmission_handler : done 10(4052) DEBUG: timer routine:6,tl=0x2ad72a80 next=(nil) 10(4052) DEBUG: retransmission_handler : request resending (t=0x2ad72970, MESSAGE s ... ) 10(4052) DEBUG: add_to_tail_of_timer[7]: 0x2ad72a80 10(4052) DEBUG: retransmission_handler : done 10(4052) DEBUG: timer routine:7,tl=0x2ad72a80 next=(nil) 10(4052) DEBUG: retransmission_handler : request resending (t=0x2ad72970, MESSAGE s ... ) 10(4052) DEBUG: add_to_tail_of_timer[7]: 0x2ad72a80 10(4052) DEBUG: retransmission_handler : done 10(4052) DEBUG: timer routine:0,tl=0x2ad72a94 next=(nil) 10(4052) DEBUG: FR_handler:stop retr. and send CANCEL (0x2ad72970) 10(4052) ->>>>>>>>> T_code=0, new_code=408 10(4052) DBG: callback type 6, id 4 entered 10(4052) DBG: acc: on_missed: no uas.request, local t; skipping 10(4052) DEBUG: local_reply: branch=0, save=0, winner=0 10(4052) DEBUG: local transaction completed 10(4052) !!!!! ref_counter: 0 10(4052) DEBUG: fifo UAC completed with status 408 10(4052) DEBUG: fifo_callback sucesssfuly completed 10(4052) DEBUG: add_to_tail_of_timer[2]: 0x2ad729b8 10(4052) DEBUG: final_response_handler : done 10(4052) DEBUG: timer routine:7,tl=0x2ad72a80 next=(nil) 10(4052) DEBUG: timer routine:2,tl=0x2ad729b8 next=(nil) 10(4052) DEBUG: wait_handler : removing 0x2ad72970 from table 10(4052) DEBUG: delete transaction 0x2ad72970 10(4052) DEBUG: wait_handler : done can somebody explain to me that it happens? do I have to put rules to the servant or to configure in another way the sip_exprees? I need him to work with nat.