Hello all,
using Kamilio 5.8.2 with EVAPI module, connecting to a Python client.
Kamailio is using following modules:
jsonrpcs.so
db_mysql.so
db_cluster.so
kex.so
corex.so
tm.so
tmx.so
sl.so
rr.so
pv.so
maxfwd.so
textops.so
textopsx.so
siputils.so
xlog.so
sanity.so
ctl.so
cfg_rpc.so
evapi.so
jansson.so
rtjson.so
dispatcher.so
permissions.s
app_jsdt.so
uac.so
xhttp.so
xhttp_rpc.so
dmq.so
dialog.so
htable.so
The (very reduced) logic is:
1 - INVITE received
2 - send request to EVAPI client with SIP headers transformed into JSON
object
3 - receive response from EVAPI client
4 - depending on response type, relay the call with routes supplied in
response using RTJSON
On its side, EVAPI Client upon receiving request from Kamailio (step #2)
1 - sends request to HTTP REST service requesting routes
2 - receives full RTJSON object (may include custom headers to add or
update or remove)
3 - return full RTJSON to Kamailio as a response
All this is working fine. *Except* that we noticed that, under testing at 1
Call per minute (not performance testing yet), the delay betway EVAPI step
#3 and Kamailio step #3 goes anything between 200ms up to 1.2 seconds!
EVAPI client is running on the same node where Kamailio is running too,
using 127.0.0.1:8448 for connection.
Knowing that there is nothing else running on the server, and that the CAPS
is like 1 call per minute, there is no load, no traffic, so why these
delays?!
Additional settings:
# ----- evapi params -----
modparam("evapi", "workers", 4)
modparam("evapi", "bind_addr", "127.0.0.1:8448")
modparam("evapi", "netstring_format", 1)
Some logs:
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949838]: INFO:
{1768314358.181270 1949838 2 1 INVITE
[email protected]} <script>: local-response -
replied locally
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949838]: INFO:
{1768314358.181325 1949838 1 1 INVITE
[email protected]} <script>: HANDLE_INVITE -
suspended transaction 5701 - Label: 625621129
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.761888 1949871 1 1 OPTIONS 123} <script>: Part 0: 'RESPONSE'
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.761928 1949871 1 1 OPTIONS 123} <script>: Part 1: '5701'
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.761936 1949871 1 1 OPTIONS 123} <script>: Part 2: '625621129'
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.761943 1949871 1 1 OPTIONS 123} <script>: Part 3: '{"action":
"ROUTE", "routes": ...
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.762018 1949871 1 1 OPTIONS 123} <script>:
evapi:message-received - t_continue for 5701/625621129
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.762078 1949871 1 1 INVITE
[email protected]} <script>: EVAPIRESPONSE -
TRANSACTION 5701|6256
Jan 13 14:25:58 bl1642 /usr/local/sbin/kamailio[1949871]: INFO:
{1768314358.762089 1949871 1 1 INVITE
[email protected]} <script>: EVAPIRESPONSE -
Resumed with RESPONSE ...
Above, we can see that Kamailio sends a request to EVAPI client
at 1768314358.181325 and response is received by EVAPI client
at 1768314358.761888, about 600ms later, which is too much!
On the other hand, EVAPI client takes less than 20ms to receive the
request, query REST service and reply back to Kamailio.
If there were anything else between Kamailio and EVAPI client, I would
probably assume there was some network delay somewhere, but both services
are running on the same server, which is mostly idle, so no network delay
can be found.
I even captured packets with tcpdump , on port 8448, and indeed,
communications between Kamailio and EVAPI client is like 20 to 30ms max!
So, why Kamailio is taking between 500ms to 1sec to process the response
received from EVAPI client? at least, this is what it seems doing....
Any clue? Any advice?
Greatly appreciated.
Atenciosamente / Kind Regards / Cordialement / Un saludo,
*Sérgio Charrua*
*www.kahea.ai <http://www.kahea.ai> / www.voip.pt <http://www.voip.pt>*
*OpenTelecom* - Consulting for Telecoms, Lda
Tel.: +351 <callto:+351+91+104+12+66>91 631 11 44
Email : *[email protected] <[email protected]>*
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