Hi everyone, We have been having a problem with our openser installation for a while, certain REGISTER requests generates errors. The openser version we are running is 1.0.0 from cvs. Does anyone have a clue why the following register generates the error below? Register: xxx.xxx.xx.xx:5061 -> yyy.yyy.yyy.yyy:5060 REGISTER sip:sip.xxxxx.xxx SIP/2.0..Via: SIP/2.0/UDP xxx.xxx.xx.xx:5061;branch=z9hG4bK-39f541a2..From: aaaa.bbbbb <sip: username123(a)sip.xxxxx.xxx&gt;;tag=ea 8cef4b108a99bco1..To: aaaa.bbbbb <sip: username123@sip.xxxxx.xxx>..Call-ID: b96fead3-f03493d4@xxx.xxx.xx.xx..CSeq: 2508 REGISTER..Max-Forwards: 70..Conta ct: aaaa.bbbbb <sip: username123@xxx.xxx.xx.xx:5061>;expires=3600..User-Agent: Linksys/RT31P2-2.0.10(LIc)..Content-Length: 0..Allow: ACK, BYE, CANCEL, IN FO, INVITE, NOTIFY, OPTIONS, REFER..Supported: x-sipura.... Error: /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: ERROR:parse_from_header: bad from header /sbin/openser[18198]: xl_get_from: ERROR cannot parse FROM header /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: xl_get_to: ERROR cannot parse TO header /sbin/openser[18198]: [REGISTER] from [<null>] to [<null>] /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: ERROR:maxfwd:is_maxfwd_present : parsing MAX_FORWARD header failed! /sbin/openser[18198]: ERROR:parse_from_header: bad from header /sbin/openser[18198]: insert_RR(): From parsing failed /sbin/openser[18198]: record_route(): Error while inserting Record-Route line /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: find_first_route: Error while parsing headers /sbin/openser[18198]: analyzing REGISTER request /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: find_credentials(): Error while parsing headers /sbin/openser[18198]: pre_auth(): Error while looking for credentials /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: ERROR: get_hdr_field: bad to header /sbin/openser[18198]: ERROR: bad header field /sbin/openser[18198]: ERROR: build_res_buf_from_sip_req: alas, parse_headers failed /sbin/openser[18198]: pre_auth(): Error while sending 400 reply Many thanks, Lars Sundqvist