[SR-Users] Bad BYE request

[Duarte Rocha]

Greetings,



This is a repeated problem, but i have more info now. Please help
understand if there is a problem on my code or if there is any kind of
Kamailio bug.



On the first INVITE of every call i apply uac_replace_from() and
uac_replace_to() in order to normalize numeration. I have the restore_mode
set as "auto".



The original numeration is :

                To : 351250000000

                From : 351211455000



The INVITE is sent to the client with To and From like this and with the
Record-Route headers (Kamailio has 2 Ips and inserts 2  Record-Routes)
containing vsf and vst parameters to help the future restores :



        To: <sip:+351250000000 at 111.111.111.111>

        From: <sip:+351211455000 at 111.111.111.111
>;tag=BD583030373631320511EAE6

                               Record-Route:
<sip:111.111.111.111;r2=on;lr;ftag=BD583030373631320511EAE6;tbk_i=2_2_Y;tbk_o=128_11_Y;vsf=AAAAABgGBAMDAAUBBQAJCnNyAwMcHwIdHQsWHwUMOA--;vst=AAAAABgGBAMHDQgJDQECA3RyAwMcHwIdGgQeHAIFOQ--;did=18e.5d62>

        Record-Route:
<sip:111.111.111.111;r2=on;lr;ftag=BD583030373631320511EAE6;tbk_i=2_2_Y;tbk_o=128_11_Y;vsf=AAAAABgGBAMDAAUBBQAJCnNyAwMcHwIdHQsWHwUMOA--;vst=AAAAABgGBAMHDQgJDQECA3RyAwMcHwIdGgQeHAIFOQ--;did=18e.5d62>



My client, upon receiving the INVITE, also does some changes in the
numeration and sends a 183 reply with the following headers :



                               Record-Route:
<sip:111.111.111.111;r2=on;lr;ftag=BD583030373631320511EAE6;tbk_i=2_2_Y;tbk_o=128_11_Y;vsf=AAAAABgGBAMDAAUBBQAJCnNyAwMcHwIdHQsWHwUMOA--;vst=AAAAABgGBAMHDQgJDQECA3RyAwMcHwIdGgQeHAIFOQ--;did=18e.5d62>

        Record-Route:
<sip:111.111.111.111;r2=on;lr;ftag=BD583030373631320511EAE6;tbk_i=2_2_Y;tbk_o=128_11_Y;vsf=AAAAABgGBAMDAAUBBQAJCnNyAwMcHwIdHQsWHwUMOA--;vst=AAAAABgGBAMHDQgJDQECA3RyAwMcHwIdGgQeHAIFOQ--;did=18e.5d62>

        From: "+351211455000" <sip:I2116446I_500 at 111.111.111.111
>;tag=BD583030373631320511EAE6

        To: <sip:+351250000000 at 111.111.111.111>;tag=as3e46f684



                               After Kamailio processes the reply, To and
>From are restored to it's original values and the reply is relayed :



                               From: <sip:351211455000 at 111.111.111.111
>;tag=BD583030373631320511EAE6

        To: <sip:351250000000 at 111.111.111.111>;tag=as3e46f684



                               Here, the restore works perfectly.



By the end of the call the client sends me a BYE request with Route, From
and To like this :



                               Route:
<sip:111.111.111.111;r2=on;lr;ftag=BD583030373631320511EAE6;tbk_i=2_2_Y;tbk_o=128_11_Y;vsf=AAAAABgGBAMDAAUBBQAJCnNyAwMcHwIdHQsWHwUMOA--;vst=AAAAABgGBAMHDQgJDQECA3RyAwMcHwIdGgQeHAIFOQ--;did=18e.5d62>,<sip:212.13.40.205;r2=on;lr;ftag=BD583030373631320511EAE6;tbk_i=2_2_Y;tbk_o=128_11_Y;vsf=AAAAABgGBAMDAAUBBQAJCnNyAwMcHwIdHQsWHwUMOA--;vst=AAAAABgGBAMHDQgJDQECA3RyAwMcHwIdGgQeHAIFOQ--;did=18e.5d62>

                               From: <sip:+351250000000 at 111.111.111.111
>;tag=as3e46f684

        To: "+351211455000" <sip:I2116446I_500 at 111.111.111.111
>;tag=BD583030373631320511EAE6



                               Here, the difference between 183 and BYE
seems to be only in the Route\Record-Route are built (2 Headers or one
header with 2 uri).



                               Now, there are a couple of problems relaying
the BYE that seem to me to be related to auto replace.



                               This BYE message isn't logged on the
onsend-route and it logs a couple of errors :

                                               ERROR: <core>
[core/parser/msg_parser.c:164]: get_hdr_field(): bad to header

                                               ERROR: <core>
[core/parser/msg_parser.c:337]: parse_headers(): bad header field [To:
"+351211455000"
<sip:Q4525417L_<:C212.13.38.148>;tag=3DC130303736313205201F18#015#012Call-ID:
020FAAC7]

                                               ERROR: dialog
[dlg_handlers.c:666]: pre_match_parse(): bad request or missing CALLID/TO
hdr :-/

                                               ERROR: <core>
[core/parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<]
in status 6: ["+351211455000" <sip:Q4525417L_] .



                               Despite not being logged on onsend_route and
creating some errors, the BYE is still relayed like this :

                                               From: <
sip:351250000000 at 111.111.111.111>;tag=as3e46f684

                                               To: "+351211455000"
<sip:Q4525417L_<:C111.111.111.111>;tag=BD583030373631320511EAE6



                               This, naturally, generates a "400 Bad
Request" reply from the next equipment.



                               I've also logged the $tU values along the
code for BYE requests and it always logs the "I2116446I_500", so i don't
know if my code can be the cause of this.





A couple of questions and comments

                               - What can i do to better debug this issue?
I want to be sure if the problem comes from my code of if it is a Kamailio
issue. Right now i'm not sure where to look.

                               - Can a request be sent without passing on
onsend_route ? I have used this code to "catch" the BYE, which works for
other BYEs - if( $rm == "BYE") {xerr("On send : To User = $tU");}
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