Hi, I am using SER at my end and have integrated it with Pstn Gateway.But,when i call to a Pstn number the call is being forwarded to the Pstn Gateway and the call goes out and gets connected and we are able to speak for 32 seconds.Exactly,after 32 seconds the call gets disconnected. Following were the logs when we tried tracing it : Sep 2 14:00:58 sip1 /usr/sbin/ser[15877]: Warning: sl_send_reply: I won't send a reply for ACK!! Sep 2 14:01:00 sip1 /usr/sbin/ser[15886]: Warning: sl_send_reply: I won't send a reply for ACK!! Sep 2 14:01:04 sip1 /usr/sbin/ser[15892]: Warning: sl_send_reply: I won't send a reply for ACK!! The following is the config file : Id: ser.cfg,v 1.21.4.1 2003/11/10 15:35:15 andrei Exp $ # # simple quick-start config script # # ----------- global configuration parameters ------------------------ #debug=3 # debug level (cmd line: -dddddddddd) #fork=yes #log_stderror=no # (cmd line: -E) /* Uncomment these lines to enter debugging mode debug=7 fork=no log_stderror=yes */ check_via=no # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=no # (cmd. line: -R) port=5060 #children=4 fifo="/tmp/ser_fifo" # ------------------ module loading ---------------------------------- # Uncomment this if you want to use SQL database loadmodule "/usr/lib/ser/modules/mysql.so" 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" # Uncomment this if you want digest authentication # mysql.so must be loaded ! loadmodule "/usr/lib/ser/modules/auth.so" loadmodule "/usr/lib/ser/modules/auth_db.so" # ----------------- setting module-specific parameters --------------- #---------------------time parameters------------- modparam("tm", "fr_inv_timer", 12 ) modparam("tm", "fr_timer", 24 ) #modparam("tm", "noisy_ctimer", 1) # -- usrloc params -- #modparam("usrloc", "db_mode", 0) # Uncomment this if you want to use SQL database # for persistent storage and comment the previous line modparam("usrloc", "db_mode", 2) # -- auth params -- # Uncomment if you are using auth module # modparam("auth_db", "calculate_ha1", yes) # # If you set "calculate_ha1" parameter to yes (which true in this config), # uncomment also the following parameter) # modparam("auth_db", "password_column", "password") # -- rr params -- # add value to ;lr param to make some broken UAs happy modparam("rr", "enable_full_lr", 1) # ------------------------- request routing logic ------------------- # main routing logic route{ # initial sanity checks -- messages with # max_forwards==0, or excessively long requests if (!mf_process_maxfwd_header("10")) { sl_send_reply("483","Too Many Hops"); break; }; if ( msg:len > max_len ) { sl_send_reply("513", "Message too big"); break; }; # we record-route all messages -- to make sure that # subsequent messages will go through our proxy; that's # particularly good if upstream and downstream entities # use different transport protocol record_route(); # loose-route processing if (loose_route()) { t_relay(); break; }; if (uri=~"^sip:1") { strip(1); # forward(202.56.170.144,5060); t_relay_to_udp("202.56.170.144", "5060"); break; }; # if the request is for other domain use UsrLoc # (in case, it does not work, use the following command # with proper names and addresses in it) if (uri==myself) { if (method=="REGISTER") { # Uncomment this if you want to use digest authentication # if (!www_authorize("iptel.org", "subscriber")) { # www_challenge("iptel.org", "0"); # break; # }; save("location"); break; }; # native SIP destinations are handled using our USRLOC DB if (!lookup("location")) { sl_send_reply("404", "Not Found"); break; }; }; # forward to current uri now; use stateful forwarding; that # works reliably even if we forward from TCP to UDP if (!t_relay()) { sl_reply_error(); }; } Could you plz tell us where could the problem be with or, are we missing any timer parameters that needs to be configured in SER.If yes, we kindly request you to help us in this matter at your earliest convenience.We are stuck in the middle of our project and we have been trying to aquire documentation on this but we weren't able to. Your help will be greatly appreciated. Regards, Vishal _________________________________________________________________ NRIs ! http://creative.mediaturf.net/creatives/icicibank/june/icicinri_tol_tl.htm Access to over 6,00,000 ATMs.