The client uses the TLS protocol registered and TCP Connection established .
There is a problem now, sending message KSR.uac.uac_req_send() from the kamilio
server to client failed sometimes,and the error is as follows：
“2023-09-04T17:22:01.515763+08:00 (3429) ERROR: tm
[../../core/forward.h:292]: msg_send_buffer(): tcp_send failed
2023-09-04T17:22:01.515763+08:00 (3429) ERROR: tm [uac.c:678]:
send_prepared_request_impl(): Attempt to send to precreated request failed ”.
meantime, the client sending message to Kamalio server succeded, and the
register status and tcp connection is normal.
After 30s, obtained the $uac_req(evcode) from the event_route[uac:reply] is
408.After this error appears, all the messages sent to this client are 408.
"
2023-08-29T03:48:43.738152+08:00 (3349) NOTICE: <script>: ===uac reply
received, callid = 0B6ECB534AE24281AED9BBBC56B140A6`yangwang2`1693252093, code
is: 408
2023-08-29T03:48:43.738825+08:00 (3349) NOTICE: <script>: ===uac reply
received, callid = 0B6ECB534AE24281AED9BBBC56B140A6`yangwang2`1693252093, code
is: 408
"
But from other information, the TCP connection is normal. Because from
Kamailio to querying this user's Location, it has not changed all day. The
client sends messages is also normal. That is, the user's registration and
sending messages can receive 200 OK.
We use netstat commands to view the user's TCP connection information on the
client and server, and the connection status is also normal.The status of the
corresponding port of the TCP connection is ESTABLISHED.
client:
netstat -ano | findstr 49957
"172. 17. 47.125:49957 XXX.96.XXX.XXX:5061 ESTABLISHED 10516"
server:
"tcp 0 0 10.11.xx.xx:5061 xxx.xxx.xxx.xxx:49957 ESTABLISHED
3467/kamailio"
This client is normal after logging in, and the problem that occurs after a
period of use (maybe some hours), and once it occurs, it fails until the user
creates a new connection and logs back in. Not all users will appear.
Why is this the case? The socket connection is fine, but uac_req_send () get
an ERROR?
I found a problem from the log file. Is it caused by duplicate callids pushed
to the same user at the same second?
Looking forward to your answer, thank you very much
Script information that may be required
kamailio.cfg ： tm mode
# ----- tm params -----
# auto-discard branches from previous serial forking leg
modparam("tm", "failure_reply_mode", 3)
# default retransmission timeout: 30sec
modparam("tm", "fr_timer", 30000)
# default invite retransmission timeout after 1xx: 120sec
modparam("tm", "fr_inv_timer", 120000)
modparam("tm", "auto_inv_100", 1)
kamalio.lua uac_req_send()
" --uac_req_send
KSR.pv.sets("$uac_req(hdrs)", hdrs)
KSR.pv.sets("$uac_req(method)", "MESSAGE")
KSR.pv.sets("$uac_req(ruri)", "sip:" .. to .. "@" .. KAM_DOMAIN)
KSR.pv.sets("$uac_req(furi)", "sip:" .. from .. "@" .. KAM_DOMAIN)
KSR.pv.sets("$uac_req(turi)", "sip:" .. to .. "@" .. KAM_DOMAIN)
KSR.pv.seti("$uac_req(evroute)", 1)
KSR.pv.sets("$uac_req(body)", content)
local ouri = (row.received ~= "" and row.received) or row.contact
KSR.pv.sets("$uac_req(ouri)", ouri)
local callid = rows[i].clientid .. "`" .. rows[i].username .. "`" ..
os.time()
KSR.pv.sets("$uac_req(callid)", callid)
KSR.uac.uac_req_send()
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