Hello, I am trying to do a force drop, using an external program. This program sends a BYE to the UA, via Unix Socket (ser.sock). The Bye looks like this: :t_uac_dlg:jm BYE sip:30003035@192.168.10.100:5060;user=phone . From: ;tag=357a0541b4a6fc93 To: ;tag=8e1f14f59d2c1f9d Cseq: 1243 BYE Call-ID: 64c75c67f1c0c450@192.168.10.115 . . This works fine!.. But I don’t receive the response of a BYE in “jm” Unix socket. After I send the Bye, I create the “jm” Unix Socket. Next I send the BYE. And then I read the “jm” socket, but don’t receive nothing. I have this error 5(6782) ERROR: tsend_dgram: failed to send: (22) Invalid argument ------------------------------------------------- My ser.cfg looks like debug=5 # debug level (cmd line: -dddddddddd) fork=yes log_stderror=yes # (cmd line: -E) check_via=no # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=no # (cmd. line: -R) port=5060 children=4 listen=192.168.10.79 unix_sock = "/tmp/ser.sock" unix_sock_children = 1 unix_tx_timeout = 2000 In my ser debug I receive this 2(6779) parse_headers: flags=ffffffffffffffff 2(6779) check_via_address(192.168.10.100, 192.168.10.100, 0) 2(6779) DEBUG:destroy_avp_list: destroying list (nil) 2(6779) receive_msg: cleaning up 1(6778) get_method: method: 'BYE' 1(6778) get_ruri: 'sip:30003035@192.168.10.100:5060;user=phone' 1(6778) get_nexthop: next hop empty 1(6778) get_headers: From: ;tag=357a0541b4a6fc93 To: ;tag=8e1f14f59d2c1f9d Cseq: 1243 BYE Call-ID: 64c75c67f1c0c450@192.168.10.115 1(6778) parse_headers: flags=ffffffffffffffff 1(6778) DEBUG: add_param: tag=8e1f14f59d2c1f9d 1(6778) end of header reached, state=29 1(6778) DEBUG: get_hdr_field: [62]; uri=[sip:30003035@192.168.10.79;user=phone] 1(6778) DEBUG: to body [] 1(6778) get_hdr_field: cseq : <1243> 1(6778) get_body_lines: 1(6778) DEBUG: add_param: tag=357a0541b4a6fc93 1(6778) end of header reached, state=29 1(6778) DEBUG:tm:t_uac: next_hop= 1(6778) DEBUG: mk_proxy: doing DNS lookup... 1(6778) DEBUG:destroy_avp_list: destroying list (nil) 1(6778) DEBUG: dlg2hash: 38378 1(6778) DEBUG: add_to_tail_of_timer[4]: 0xbd6aa390 1(6778) DEBUG: add_to_tail_of_timer[0]: 0xbd6aa3a0 5(6782) SIP Reply (status): 5(6782) version: 5(6782) status: <481> 5(6782) reason: 5(6782) parse_headers: flags=2 5(6782) Found param type 232, = ; state=16 5(6782) end of header reached, state=5 5(6782) parse_headers: Via found, flags=2 5(6782) parse_headers: this is the first via 5(6782) After parse_msg... 5(6782) forward_reply: found module tm, passing reply to it 5(6782) DEBUG: t_check: msg id=5 global id=0 T start=0xffffffff 5(6782) parse_headers: flags=22 5(6782) DEBUG: add_param: tag=8e1f14f59d2c1f9d 5(6782) end of header reached, state=29 5(6782) DEBUG: get_hdr_field: [62]; uri=[sip:30003035@192.168.10.79;user=phone] 5(6782) DEBUG: to body [] 5(6782) get_hdr_field: cseq : <1243> 5(6782) DEBUG: t_reply_matching: hash 38378 label 2015071148 branch 0 5(6782) DEBUG: t_reply_matching: reply matched (T=0xbd6aa278)! 5(6782) DEBUG: t_check: msg id=5 global id=5 T end=0xbd6aa278 5(6782) DEBUG: reply_received: org. status uas=0, uac[0]=0 local=2 is_invite=0) 5(6782) ->>>>>>>>> T_code=0, new_code=481 5(6782) Warning: run_failure_handlers: no UAC support (0, 256) 5(6782) DEBUG: local_reply: branch=0, save=0, winner=0 5(6782) DEBUG: local transaction completed 5(6782) DBG: trans=0xbd6aa278, callback type 256, id 0 entered 5(6782) ERROR: tsend_dgram: failed to send: (22) Invalid argument 5(6782) DEBUG: cleanup_uac_timers: RETR/FR timers reset 5(6782) DEBUG: add_to_tail_of_timer[2]: 0xbd6aa2c0 5(6782) DEBUG:destroy_avp_list: destroying list (nil) 5(6782) receive_msg: cleaning up Thanks in advance Ing. Francisco Talavera