### Description
siptrace module not mirror relayed ACK message.
### Troubleshooting
#### Reproduction
Need patch vanilla kamailio config like this diff
```patch
--- kamailio.cfg
+++ /etc/kamailio/kamailio.cfg
@@ -1,4 +1,8 @@
#!KAMAILIO
+#!define WITH_DEBUG
+#!define WITH_PSTN
+#!define WITH_NAT
+
#
# Kamailio (OpenSER) SIP Server v5.1 - default configuration script
# - web: https://www.kamailio.org
@@ -137,7 +141,9 @@
#!define FLT_ACCMISSED 2
#!define FLT_ACCFAILED 3
#!define FLT_NATS 5
+#!define FLT_SIPTRACE 8
+
#!define FLB_NATB 6
#!define FLB_NATSIPPING 7
@@ -198,8 +204,8 @@
* pstn.gw_ip = "10.0.0.101" desc "My PSTN GW Address"
*
* - by default is empty to avoid misrouting */
-pstn.gw_ip = "" desc "PSTN GW Address"
-pstn.gw_port = "" desc "PSTN GW Port"
+pstn.gw_ip = "8.8.8.8" desc "PSTN GW Address"
+pstn.gw_port = "5060" desc "PSTN GW Port"
#!endif
#!ifdef WITH_VOICEMAIL
@@ -286,6 +292,16 @@
loadmodule "debugger.so"
#!endif
+loadmodule "siptrace.so"
+modparam("siptrace", "duplicate_uri", "sip:217.12.247.98:9060")
+modparam("siptrace", "hep_mode_on", 1)
+modparam("siptrace", "hep_version", 3)
+modparam("siptrace", "hep_capture_id", 1)
+modparam("siptrace", "trace_to_database", 0)
+## `trace_flag` value must be equal to FLT_SIPTRACE value at head of
"default.cfg" file
+modparam("siptrace", "trace_flag", 8)
+modparam("siptrace", "trace_on", 1)
+
# ----------------- setting module-specific parameters ---------------
@@ -310,9 +326,10 @@
# ----- rr params -----
# set next param to 1 to add value to ;lr param (helps with some UAs)
-modparam("rr", "enable_full_lr", 0)
+modparam("rr", "enable_full_lr", 1)
# do not append from tag to the RR (no need for this script)
modparam("rr", "append_fromtag", 0)
+modparam("rr", "enable_double_rr", 1)
# ----- registrar params -----
modparam("registrar", "method_filtering", 1)
@@ -536,6 +553,9 @@
if(!t_is_set("failure_route")) t_on_failure("MANAGE_FAILURE");
}
+ sip_trace();
+ setflag(FLT_SIPTRACE);
+
if (!t_relay()) {
sl_reply_error();
}
```
#### Debugging Data
none
#### Log Messages
```text
{1 20 ACK 1258335781} 15(2198) DEBUG: siptrace [siptrace.c:507]:
sip_trace_store_db(): database connection not initialized
{1 20 ACK 1258335781} 15(2198) DEBUG: siptrace [siptrace_hep.c:498]:
pipport2su(): the port string is 35060
{1 20 ACK 1258335781} 15(2198) DEBUG: siptrace [siptrace_hep.c:498]:
pipport2su(): the port string is 5060
{1 20 ACK 1258335781} 15(2198) DEBUG: <core> [core/proxy.c:264]: mk_proxy():
doing DNS lookup...
{1 20 ACK 1258335781} 15(2198) DEBUG: siptrace [siptrace_hep.c:183]:
trace_send_hep3_duplicate(): setting up the socket_info
{1 20 ACK 1258335781} 15(2198) exec: *** cfgtrace:request_route=[RELAY]
c=[/etc/kamailio/kamailio.cfg] l=557 a=39 n=setflag
{1 20 ACK 1258335781} 15(2198) exec: *** cfgtrace:request_route=[RELAY]
c=[/etc/kamailio/kamailio.cfg] l=562 a=16 n=if
{1 20 ACK 1258335781} 15(2198) exec: *** cfgtrace:request_route=[RELAY]
c=[/etc/kamailio/kamailio.cfg] l=559 a=24 n=t_relay
{1 20 ACK 1258335781} 15(2198) DEBUG: tm [t_lookup.c:1319]: t_newtran(): msg
id=1 , global msg id=0 , T on entrance=0xffffffffffffffff
{1 20 ACK 1258335781} 15(2198) DEBUG: tm [t_lookup.c:476]: t_lookup_request():
start searching: hash=11341, isACK=1
{1 20 ACK 1258335781} 15(2198) DEBUG: tm [t_lookup.c:435]: matching_3261():
RFC3261 transaction matching failed
{1 20 ACK 1258335781} 15(2198) DEBUG: tm [t_lookup.c:659]: t_lookup_request():
no transaction found
{1 20 ACK 1258335781} 15(2198) DEBUG: tm [t_funcs.c:284]: t_relay_to():
forwarding ACK statelessly
{1 20 ACK 1258335781} 15(2198) DEBUG: <core> [core/md5utils.c:67]:
MD5StringArray(): MD5 calculated: 307e4757bd94a80e26f17adb5260cb13
{1 20 ACK 1258335781} 15(2198) DEBUG: <core> [core/forward.c:557]:
forward_request(): Sending:
```
Received ACK is mirrored but relayed ACK is not mirrored.
Full log in attached file `kamailio.log`
[kamailio.log](https://github.com/kamailio/kamailio/files/2766269/kamailio.log)
#### SIP Traffic
SIP messages and mirrored traffic in attached pcap file.
Packet 19 is not mirrored.
[kamailio-ack.zip](https://github.com/kamailio/kamailio/files/2766281/kamailio-ack.zip)
### Possible Solutions
Not know
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
/ # kamailio -v
version: kamailio 5.1.6 (x86_64/linux)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC,
F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled on 03:24:34 Nov 23 2018 with gcc 8.2.0
```
* **Operating System**:
Alpine Linux edge
```
/ # cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.8.0
PRETTY_NAME="Alpine Linux v3.8"
HOME_URL="http://alpinelinux.org";
BUG_REPORT_URL="http://bugs.alpinelinux.org";
```
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