[Users] errors when making a call!

[messa at innsof.com]

Hi all

   When imake calls, signalisation goes well but, when, i hang up my
client, i have no voice in any client!
And my openser server display methese errors:

0(4335) lookup(): Error while extracting address of record
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) ERROR: parse_sip_msg_uri: bad uri <sip:>
 0(4335) WARNING: do_action:error in expression
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) extract_aor(): Error while parsing Address of Record
 0(4335) lookup(): Error while extracting address of record
 0(4335) Warning: sl_send_reply: I won't send a reply for ACK!!
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) ERROR: parse_sip_msg_uri: bad uri <sip:>
 0(4335) loose_route: Error while parsing Request URI
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) ERROR: parse_sip_msg_uri: bad uri <sip:>
 0(4335) WARNING: do_action:error in expression
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) extract_aor(): Error while parsing Address of Record
 0(4335) lookup(): Error while extracting address of record
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) ERROR: parse_sip_msg_uri: bad uri <sip:>
 0(4335) WARNING: do_action:error in expression
 0(4335) ERROR: parse_uri: uri too short: <sip:> (4)
 0(4335) extract_aor(): Error while parsing Address of Record
 0(4335) lookup(): Error while extracting address of record
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy
 0(4335) force_rtp_proxy2: incorrect port in reply from rtp proxy

How can i fix those errors?
 Thanks for help
                                     Serge