[SR-Users] Bad BYE request
Henning Westerholt
hw at skalatan.de
Tue Oct 8 12:06:11 CEST 2019
Hi Duarte,
answering about how to debug it further and see if it is caused from Kamailio or outside it.
As you got an error about a wrong SIP message:
ERROR: <core> [core/parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: ["+351211455000" <sip:Q4525417L_] .
I would do a trace with ngrep or tcpdump and analyze it with wireshark so see if the message has maybe an error around this part quoted above.
Cheers,
Henning
Am 04.10.19 um 20:42 schrieb 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<mailto:sip%3A%2B351250000000 at 111.111.111.111>>
From: <sip:+351211455000 at 111.111.111.111<mailto:sip%3A%2B351211455000 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<mailto:sip%3AI2116446I_500 at 111.111.111.111>>;tag=BD583030373631320511EAE6
To: <sip:+351250000000 at 111.111.111.111<mailto:sip%3A%2B351250000000 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<mailto:sip%3A351211455000 at 111.111.111.111>>;tag=BD583030373631320511EAE6
To: <sip:351250000000 at 111.111.111.111<mailto:sip%3A351250000000 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<mailto:sip%3A%2B351250000000 at 111.111.111.111>>;tag=as3e46f684
To: "+351211455000" <sip:I2116446I_500 at 111.111.111.111<mailto:sip%3AI2116446I_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<mailto:sip%3A351250000000 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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