[SR-Users] Dialog keep alive options are with error parsing headers

Hello there, I'm using dialog module to send keep alive options to callee and caller in order to detect if dialog still up, but when kamailio generates the OPTION and parse it, gives the following errors: [root@c4-compute02-srv1 kamailio]# 37(1587) DEBUG: dialog [dlg_hash.c:614]: dlg_lookup(): ref dlg 0x7f89134c1d40 with 1 -> 3 37(1587) DEBUG: dialog [dlg_hash.c:616]: dlg_lookup(): dialog id=2210 found on entry 2350 37(1587) DEBUG: dialog [dlg_req_within.c:427]: dlg_send_ka(): sending OPTIONS to caller 37(1587) DEBUG: tm [uac.c:249]: t_uac_prepare(): DEBUG:tm:t_uac: next_hop=< sip:unknown@62.28.197.25:5060> 37(1587) DEBUG: <core> [dns_cache.c:3293]: dns_srv_sip_resolve(): (62.28.197.25, 0, 0), ip, ret=0 37(1587) DEBUG: tm [uac.c:150]: dlg2hash(): DEBUG: dlg2hash: 14692 37(1587) DEBUG: <core> [parser/msg_parser.c:606]: parse_msg(): SIP Request: 37(1587) DEBUG: <core> [parser/msg_parser.c:608]: parse_msg(): method: <OPTIONS> 37(1587) DEBUG: <core> [parser/msg_parser.c:610]: parse_msg(): uri: < sip:unknown@62.28.197.25:5060> 37(1587) DEBUG: <core> [parser/msg_parser.c:612]: parse_msg(): version: <SIP/2.0> 37(1587) DEBUG: <core> [parser/parse_via.c:1254]: parse_via_param(): Found param type 232, <branch> = <z9hG4bK4693.2af96e95000000000000000000000000.0>; state=16 37(1587) DEBUG: <core> [parser/parse_via.c:2642]: parse_via(): end of header reached, state=5 37(1587) DEBUG: <core> [parser/msg_parser.c:496]: parse_headers(): parse_headers: Via found, flags=2 37(1587) DEBUG: <core> [parser/msg_parser.c:498]: parse_headers(): parse_headers: this is the first via 37(1587) DEBUG: <core> [parser/parse_addr_spec.c:172]: parse_to_param(): DEBUG: add_param: tag=90d40279ee5745d8851aa989e6fadfc2 37(1587) DEBUG: <core> [parser/parse_addr_spec.c:894]: parse_addr_spec(): end of header reached, state=29 37(1587) DEBUG: <core> [parser/msg_parser.c:173]: get_hdr_field(): DEBUG: get_hdr_field: <To> [64]; uri=[sip:unknown@62.28.197.6] 37(1587) DEBUG: <core> [parser/msg_parser.c:175]: get_hdr_field(): DEBUG: to body [<sip:unknown@62.28.197.6>] 37(1587) DEBUG: <core> [parser/msg_parser.c:153]: get_hdr_field(): get_hdr_field: cseq <CSeq>: <0> <OPTIONS> 37(1587) DEBUG: <core> [parser/msg_parser.c:187]: get_hdr_field(): DEBUG: get_hdr_body : content_length=0 *37(1587) ERROR: <core> [parser/msg_parser.c:96]: get_hdr_field(): ERROR: get_hdr_field: bad header* 37(1587) DEBUG: <core> [parser/msg_parser.c:280]: get_hdr_field(): get_hdr_field: error exit *37(1587) INFO: <core> [parser/msg_parser.c:338]: parse_headers(): ERROR: bad header field [VC* *]* 37(1587) DEBUG: topoh [topoh_mod.c:232]: th_prepare_msg(): parsing headers failed37(1587) DEBUG: <core> [parser/msg_parser.c:606]: parse_msg(): SIP Request: 37(1587) DEBUG: <core> [parser/msg_parser.c:608]: parse_msg(): method: <OPTIONS> 37(1587) DEBUG: <core> [parser/msg_parser.c:610]: parse_msg(): uri: < sip:unknown@62.28.197.25:5060> 37(1587) DEBUG: <core> [parser/msg_parser.c:612]: parse_msg(): version: <SIP/2.0> 37(1587) DEBUG: <core> [parser/parse_via.c:1254]: parse_via_param(): Found param type 232, <branch> = <z9hG4bK4693.2af96e95000000000000000000000000.0>; state=16 37(1587) DEBUG: <core> [parser/parse_via.c:2642]: parse_via(): end of header reached, state=5 37(1587) DEBUG: <core> [parser/msg_parser.c:496]: parse_headers(): parse_headers: Via found, flags=2 37(1587) DEBUG: <core> [parser/msg_parser.c:498]: parse_headers(): parse_headers: this is the first via 37(1587) DEBUG: <core> [parser/parse_addr_spec.c:172]: parse_to_param(): DEBUG: add_param: tag=90d40279ee5745d8851aa989e6fadfc2 37(1587) DEBUG: <core> [parser/parse_addr_spec.c:894]: parse_addr_spec(): end of header reached, state=29 37(1587) DEBUG: <core> [parser/msg_parser.c:173]: get_hdr_field(): DEBUG: get_hdr_field: <To> [64]; uri=[sip:unknown@62.28.197.6] 37(1587) DEBUG: <core> [parser/msg_parser.c:175]: get_hdr_field(): DEBUG: to body [<sip:unknown@62.28.197.6>] 37(1587) DEBUG: <core> [parser/msg_parser.c:153]: get_hdr_field(): get_hdr_field: cseq <CSeq>: <0> <OPTIONS> 37(1587) DEBUG: <core> [parser/parse_addr_spec.c:172]: parse_to_param(): DEBUG: add_param: tag=e34d43e164ad4b7392dc9c6e1058a983 37(1587) DEBUG: <core> [parser/parse_addr_spec.c:894]: parse_addr_spec(): end of header reached, state=29 37(1587) DEBUG: dialog [dlg_cseq.c:215]: dlg_cseq_msg_sent(): traking cseq updates 37(1587) DEBUG: dialog [dlg_hash.c:671]: internal_get_dlg(): ref dlg 0x7f89134c1d40 with 1 -> 4 37(1587) DEBUG: dialog [dlg_hash.c:674]: internal_get_dlg(): dialog callid='13208317017c42128fbf00e1685ee1b3' found on entry 2350, dir=2 37(1587) DEBUG: dialog [dlg_cseq.c:233]: dlg_cseq_msg_sent(): request not going downstream (2) 37(1587) DEBUG: dialog [dlg_hash.c:846]: dlg_unref(): unref dlg 0x7f89134c1d40 with 1 -> 3 37(1587) DEBUG: dialog [dlg_req_within.c:452]: dlg_send_ka(): keep-alive sent to caller 37(1587) DEBUG: dialog [dlg_req_within.c:427]: dlg_send_ka(): sending OPTIONS to callee I'm using the following dialog configuration: modparam("dialog","db_url", DBURL) modparam("dialog","db_mode", 0) modparam("dialog","enable_stats", 1) modparam("dialog","dlg_flag", DLG_FLAG) modparam("dialog","profiles_with_value","concurrentcalls") modparam("dialog", "detect_spirals", 1) modparam("dialog","dlg_match_mode", 2) modparam("dialog", "initial_cbs_inscript", 0) modparam("dialog", "default_timeout", 3600) modparam("dialog", "send_bye", 1) modparam("dialog", "timeout_avp", "$avp(s:timeout_dlg)") modparam("dialog", "track_cseq_updates", 1) modparam("dialog", "ka_timer", 10) modparam("dialog", "ka_interval", 30) I'm also using topoh module. Anyone can help me to identify if I'm doing the proper configuration? Thank you for your support Best Regards José Seabra