[Serusers] ERROR: extract_body: message body has lenght zero

Hi everybody, I'm trying to get SER working and I get these errors(below) during running of SER. I've already found an answer in the list, but still don't know when this situation happen. After this, all UA's cannot register with SER. Would anybody be able to tell me how can I fix this. how can I set sending only INVITE, 183 and 200 messages to the rtpproxy? I'm using nathelper.cfg from source package with minor changes. Thanks for help Ladia This is from syslog: Dec 2 21:31:44 linux /usr/local/sbin/ser[9313]: ERROR: extract_body: message body has lenght zero Dec 2 21:31:44 linux /usr/local/sbin/ser[9313]: ERROR: force_rtp_proxy2: can't extract body from the message Dec 2 21:31:44 linux /usr/local/sbin/ser[9313]: ERROR: on_reply processing failed Dec 2 21:31:44 linux /usr/local/sbin/ser[9313]: ERROR: extract_body: message body has lenght zero Dec 2 21:31:44 linux /usr/local/sbin/ser[9313]: ERROR: force_rtp_proxy2: can't extract body from the message Dec 2 21:31:44 linux /usr/local/sbin/ser[9313]: ERROR: on_reply processing failed