<font size=2 face="sans-serif">Hello guys,</font>
<br>
<br><font size=2 face="sans-serif">I'm following this guide: </font><a href="https://kb.asipto.com/asterisk:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb"><font size=2 color=blue face="sans-serif">https://kb.asipto.com/asterisk:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb</font></a>
<br>
<br><font size=2 face="sans-serif">And I have the following schema:</font>
<br>
<br><font size=2 face="sans-serif"> Phone A ----->
Kamailio -----> Asterisk ----->
Phone B </font>
<br><font size=2 face="sans-serif">(10.0.8.249) (10.0.6.123)
(10.0.3.144)
(10.0.13.23)</font>
<br>
<br><font size=2 face="sans-serif">I think the flow it is like (because
when UAC register to Asterisk, the contact points to Kamailio IP): </font>
<br>
<br><font size=2 face="sans-serif">1. Phone A --> Kamailio --> Asterisk
<br>
2. Asterisk --> Kamailio --> Phone B</font>
<br>
<br><font size=2 face="sans-serif">In attachment is the pcap of the call,
kamailio config.</font>
<br>
<br><font size=2 face="sans-serif">The problem is that I never receive
ACK after 200 OK and call drops after 30 seconds?</font>
<br>
<br><font size=2 face="sans-serif">Kamailio version 5.1 and Asterisk version
15.1</font>
<br>
<br><font size=2 face="sans-serif">Phones are grandstreams and also tested
with microsip soft client and same results... Like "Phone A"
never sends ACK back</font>
<br>
<br><font size=2 face="sans-serif">I tried different approaches to change
contact header in 200 OK, because is Asterisk IP. Disable NAT handling.
Different "nat_uac_test" flags, but still without success :(</font>
<br>
<br><font size=2 face="sans-serif">Also tried with this NAT detection and
manage routes (again without any success) - source </font><a href=https://github.com/sipwise/kamailio/blob/master/etc/kamailio.cfg><font size=2 color=blue face="sans-serif">https://github.com/sipwise/kamailio/blob/master/etc/kamailio.cfg</font></a>
<br>
<br><font size=2 face="sans-serif"># Caller NAT detection</font>
<br><font size=2 face="sans-serif">route[NATDETECT] {</font>
<br><font size=2 face="sans-serif">#!ifdef WITH_NAT</font>
<br><font size=2 face="sans-serif"> force_rport();</font>
<br><font size=2 face="sans-serif"> if
(nat_uac_test("19")) {</font>
<br><font size=2 face="sans-serif">
if (is_method("REGISTER")) {</font>
<br><font size=2 face="sans-serif">
fix_nated_register();</font>
<br><font size=2 face="sans-serif">
} else {</font>
<br><font size=2 face="sans-serif">
if(is_first_hop())
{</font>
<br><font size=2 face="sans-serif">
set_contact_alias();</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif">
setflag(FLT_NATS);</font>
<br><font size=2 face="sans-serif"> }</font>
<br><font size=2 face="sans-serif">#!endif</font>
<br><font size=2 face="sans-serif"> return;</font>
<br><font size=2 face="sans-serif">}</font>
<br>
<br><font size=2 face="sans-serif"># RTPProxy control and signaling updates
for NAT traversal</font>
<br><font size=2 face="sans-serif">route[NATMANAGE] {</font>
<br><font size=2 face="sans-serif">#!ifdef WITH_NAT</font>
<br><font size=2 face="sans-serif"> if
(is_request()) {</font>
<br><font size=2 face="sans-serif">
if(has_totag()) {</font>
<br><font size=2 face="sans-serif">
if(check_route_param("nat=yes"))
{</font>
<br><font size=2 face="sans-serif">
setbflag(FLB_NATB);</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif"> }</font>
<br><font size=2 face="sans-serif"> if
(!(isflagset(FLT_NATS) || isbflagset(FLB_NATB))) return;</font>
<br>
<br><font size=2 face="sans-serif"> if(nat_uac_test("8"))
{</font>
<br><font size=2 face="sans-serif">
rtpproxy_manage("co");</font>
<br><font size=2 face="sans-serif"> }
else {</font>
<br><font size=2 face="sans-serif">
rtpproxy_manage("cor");</font>
<br><font size=2 face="sans-serif"> }</font>
<br>
<br><font size=2 face="sans-serif"> if
(is_request()) {</font>
<br><font size=2 face="sans-serif">
if (!has_totag()) {</font>
<br><font size=2 face="sans-serif">
if(t_is_branch_route())
{</font>
<br><font size=2 face="sans-serif">
add_rr_param(";nat=yes");</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif"> }</font>
<br><font size=2 face="sans-serif"> if
(is_reply()) {</font>
<br><font size=2 face="sans-serif">
if(isbflagset(FLB_NATB)) {</font>
<br><font size=2 face="sans-serif">
if(is_first_hop())</font>
<br><font size=2 face="sans-serif">
set_contact_alias();</font>
<br><font size=2 face="sans-serif">
}</font>
<br><font size=2 face="sans-serif"> }</font>
<br><font size=2 face="sans-serif">#!endif</font>
<br><font size=2 face="sans-serif"> return;</font>
<br><font size=2 face="sans-serif">}</font>
<br>
<br>
<br>
<br>
<br><font size=2 face="sans-serif">Thanks in advance</font>
<br><font size=2 face="sans-serif"><br>
</font>
<br>
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