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@111.111.111.111>

From: <sip:+351211455000@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>

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

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

To: <sip:+351250000000@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@111.111.111.111>;tag=BD583030373631320511EAE6

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

To: "+351211455000" <sip:I2116446I_500@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@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");}