Hello, guys: thanks for your replies. I run SER and make sip call. I configured ser.cfg and some message are displayed as fowwlow: loadmodule "/usr/local/lib/ser/modules/mysql.so" loadmodule "/usr/local/lib/ser/modules/sl.so" loadmodule "/usr/local/lib/ser/modules/tm.so" loadmodule "/usr/local/lib/ser/modules/rr.so" loadmodule "/usr/local/lib/ser/modules/maxfwd.so" loadmodule "/usr/local/lib/ser/modules/usrloc.so" loadmodule "/usr/local/lib/ser/modules/registrar.so" loadmodule "/usr/local/lib/ser/modules/auth.so" loadmodule "/usr/local/lib/ser/modules/auth_db.so" loadmodule "/usr/local/lib/ser/modules/uri_db.so" loadmodule "/usr/local/lib/ser/modules/acc.so" modparam("acc","log_level",1) modparam("acc","log_flag",1) # modparam("acc", "db_url","flatstore:/var/log/acc") modparam("acc", "db_flag", 1) # modparam("acc", "db_missed_flag", 1) # modparam("acc", "failed_transactions", 2) modparam("auth_db|uri_db|usrloc|acc", "db_url", "mysql://ser:heslo@localhost/ser") modparam("auth_db", "calculate_ha1", 1) modparam("auth_db", "password_column", "password") modparam("usrloc", "db_mode", 1) if (method=="INVITE" || method=="ACK") { log (1, "%method - INVITE or ACK MESSAGE RECEIVED - START ACCOUNTING\n"); setflag(1); # record_route(); }; if (method=="BYE" || method=="CANCEL") { log (1, "%method - STOP ACCOUNTING\n"); setflag(1); # record_route(); }; # end of testing -------------------------------------------- if (method!="REGISTER") { record_route(); setflag(2); }; some messages are capured : ACK sip:800@192.168.1.188:5061 SIP/2.0 Record-Route: <sip:192.168.1.26;ftag=78086448;lr=on> Via: SIP/2.0/UDP 192.168.1.26;branch=0 Via: SIP/2.0/UDP 211.25.2.30:5061;received=192.168.1.26;rport=5061;branch=z9hG4bK255A602DB910243AC238B003FB36CE58 From: 333 <sip:333@192.168.1.26:5061>;tag=78086448 To: <sip:800@192.168.1.26>;tag=542148979 Contact: <sip:333@211.25.2.30:5061> Call-ID: 0CF994AF-C18C-4447-A6D3-758FF4EB99A8(a)192.168.1.26 CSeq: 9213 ACK Max-Forwards: 16 Content-Length: 0 SIP/2.0 200 Ok Via: SIP/2.0/UDP 211.25.2.30:5061;received=192.168.1.26;rport=5061;branch=z9hG4bK7D8A9CF509DF4CAC2EB9DF19BEB26EE3 From: 333 <sip:333@192.168.1.26:5061>;tag=78086448 To: <sip:800@192.168.1.26>;tag=542148979 Contact: <sip:800@192.168.1.188:5061> Call-ID: 0CF994AF-C18C-4447-A6D3-758FF4EB99A8(a)192.168.1.26 CSeq: 9214 BYE Server: X-Lite release 1105d Content-Length: 0 2(2160) WARNING:vqm_resize: resize(0) called 2(2160) DEBUG: add_to_tail_of_timer[2]: 0x422c2440 2(2160) DEBUG: reply relayed. buf=0x8103438: SIP/2.0 2..., shmem=0x422c3e68: SIP/2.0 2 2(2160) DBG: trans=0x422c23f8, callback type 128, id 0 entered 2(2160) ACC: transaction answered: method=BYE, i-uri=sip:800@192.168.1.188:5061, o-uri=sip:800@192.168.1.188:5061, call_id=0CF994AF-C18C-4447-A6D3-758FF4EB99A8(a)192.168.1.26, from=333 I know there is something happened, maybe, somewhere is worng in route section. Please give me some suggestions! thanks in advance! lizhong