[SR-Users] Not able to connect kamailio via SIP Client

[Daniel Tryba]

On Thu, Feb 21, 2019 at 04:55:40PM +0530, Prabhat Kumar wrote:
> When i try to login via SIP Client(zoiper) i am getting the following error.
> 
> Feb 21 11:20:26 ip-10-0-0-121 /usr/local/sbin/kamailio[21131]: INFO:
> <core> [core/parser/parse_fline.c:144]: parse_first_line():
> ERROR:parse_first_line: method not followed by SP
> Feb 21 11:20:26 ip-10-0-0-121 /usr/local/sbin/kamailio[21131]: ERROR:
> <core> [core/parser/parse_fline.c:257]: parse_first_line():
> parse_first_line: bad message (offset: 0)
> Feb 21 11:20:26 ip-10-0-0-121 /usr/local/sbin/kamailio[21131]: ERROR:
> <core> [core/parser/msg_parser.c:675]: parse_msg(): ERROR: parse_msg:
> message=<???#007???>
> Feb 21 11:20:26 ip-10-0-0-121 /usr/local/sbin/kamailio[21131]: ERROR:
> <core> [core/receive.c:199]: receive_msg(): core parsing of SIP
> message failed (114.241.140.68:4569/1)
> 
> 
> How can i fix this problem?

By learning how to debug problems.

Read the error: 
parse_first_line: method not followed by SP
parse_first_line: bad message (offset: 0)

So there is something wrong with the message (esp. the first line)
somehow. Now use tools to capture this message (tcpdump/ngrep/wireshark)
and check if there is something wrong with the message (read the related
SIP RFCs to figure out how the message should look). The error mentions
"method not followed by SP(ace?)". So what does the first line look
like?

If the message is bad, fix the client.  If the message isn't, you either
have found a kamailio bug or more likely made a mistake in your config.
Either way, enable more logging for debugging.
https://www.kamailio.org/dokuwiki/doku.php/tutorials:debug-syslog-messages
gives some info. If you still need help, then give the relevant input and
config.