<h3>Description</h3>
<p>I am using TOPOS module to hide internal topology. The module strips Via header from INVITE sip message correctly but do not strip from ACK and BYE.</p>
<p>See Sip Traffic section for details.</p>
<h4>SIP Traffic</h4>
<pre><code>INVITE sip:79200204544@95.79.44.126:5060 SIP/2.0
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK6ede.37d0b08c7b0331a435a0943a939a4025.0
Max-Forwards: 70
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943281 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.8.5+git-20190227T164909Z~cb1f3ab6f2~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 352
X-FS-Support: update_display,send_info
Remote-Party-ID: <sip:"testin2"@35.228.92.211>;party=calling;screen=yes;privacy=off
Contact: <sip:btpsh-5caf4729-2afa-2@35.204.224.219>

v=0
o=FreeSWITCH 1554967661 1554967662 IN IP4 35.228.92.211
s=FreeSWITCH
c=IN IP4 35.228.92.211
t=0 0
m=audio 26486 RTP/AVP 18 0 8 102 103 4 101
a=rtpmap:18 G729/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:102 SPEEX/8000
a=rtpmap:103 L16/8000
a=rtpmap:4 G723/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20


SIP/2.0 100 Trying
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK6ede.37d0b08c7b0331a435a0943a939a4025.0
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943281 INVITE
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,REGISTER,PRACK,INFO,NOTIFY,REFER,SUBSCRIBE
Cisco-Guid: 52032-2942042128-2148574276-299034469
User-Agent: TELES CELLX Plus 20.5.36.1 58216060749209
Content-Length: 0


SIP/2.0 183 Session in Progress
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK6ede.37d0b08c7b0331a435a0943a939a4025.0
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943281 INVITE
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,REGISTER,PRACK,INFO,NOTIFY,REFER,SUBSCRIBE
Cisco-Guid: 52032-2942042128-2148574276-299034469
Contact: <sip:79200204544@95.79.44.126>
User-Agent: TELES CELLX Plus 20.5.36.1 58216060749209
Content-Type: application/sdp
Content-Length: 175

v=0
o=- 16 1 IN IP4 95.79.44.126
s=-
c=IN IP4 95.79.44.126
t=0 0
m=audio 29000 RTP/AVP 4
a=sendrecv
a=ptime:1200
a=rtpmap:4 G723/8000
a=fmtp:4 bitrate=6.3;annexa=no


SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK6ede.37d0b08c7b0331a435a0943a939a4025.0
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943281 INVITE
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,REGISTER,PRACK,INFO,NOTIFY,REFER,SUBSCRIBE
Cisco-Guid: 52032-2942042128-2148574276-299034469
Contact: <sip:79200204544@95.79.44.126>
User-Agent: TELES CELLX Plus 20.5.36.1 58216060749209
Content-Type: application/sdp
Content-Length: 175

v=0
o=- 16 2 IN IP4 95.79.44.126
s=-
c=IN IP4 95.79.44.126
t=0 0
m=audio 29000 RTP/AVP 4
a=sendrecv
a=ptime:1200
a=rtpmap:4 G723/8000
a=fmtp:4 bitrate=6.3;annexa=no


SIP/2.0 200 OK
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK6ede.37d0b08c7b0331a435a0943a939a4025.0
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943281 INVITE
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,REGISTER,PRACK,INFO,NOTIFY,REFER,SUBSCRIBE
Cisco-Guid: 52032-2942042128-2148574276-299034469
Contact: <sip:79200204544@95.79.44.126>
User-Agent: TELES CELLX Plus 20.5.36.1 58216060749209
Content-Type: application/sdp
Content-Length: 175

v=0
o=- 16 3 IN IP4 95.79.44.126
s=-
c=IN IP4 95.79.44.126
t=0 0
m=audio 29000 RTP/AVP 4
a=sendrecv
a=ptime:1200
a=rtpmap:4 G723/8000
a=fmtp:4 bitrate=6.3;annexa=no


ACK sip:79200204544@95.79.44.126:5060;transport=udp SIP/2.0
Record-Route: <sip:35.204.224.219;lr;ftag=S2363F7Qt7eNr>
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK6ede.1e6c3211c8351ad95b4e6ab73b1edb93.0
Via: SIP/2.0/UDP 35.228.92.211;received=10.166.0.2;rport=5060;branch=z9hG4bK5025HQ19BgBve
Max-Forwards: 70
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
Contact: <sip:gw+kamailio@35.204.224.219:5060;gw=kamailio;transport=udp>
CSeq: 2943281 ACK
Content-Length: 0


BYE sip:79200204544@95.79.44.126:5060;transport=udp SIP/2.0
Record-Route: <sip:35.204.224.219;lr;ftag=S2363F7Qt7eNr>
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK3ede.a79e492bc10c8b5d668d6925dd745145.0
Via: SIP/2.0/UDP 35.228.92.211;received=10.166.0.2;rport=5060;branch=z9hG4bK69UyKjjD9r1ea
Max-Forwards: 70
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943282 BYE
User-Agent: FreeSWITCH-mod_sofia/1.8.5+git-20190227T164909Z~cb1f3ab6f2~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Reason: Q.850;cause=16;text="NORMAL_CLEARING"
Content-Length: 0


SIP/2.0 200 OK
Via: SIP/2.0/UDP 35.204.224.219:5060;branch=z9hG4bK3ede.a79e492bc10c8b5d668d6925dd745145.0
Via: SIP/2.0/UDP 35.228.92.211;received=10.166.0.2;rport=5060;branch=z9hG4bK69UyKjjD9r1ea
Record-Route: <sip:35.204.224.219;lr;ftag=S2363F7Qt7eNr>
From: "" <sip:testin2@35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544@10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
CSeq: 2943282 BYE
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,REGISTER,PRACK,INFO,NOTIFY,REFER,SUBSCRIBE
Cisco-Guid: 52032-2942042128-2148574276-299034469
Contact: <sip:79200204544@95.79.44.126>
User-Agent: TELES CELLX Plus 20.5.36.1 58216060749209
Content-Length: 0

</code></pre>
<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>version: kamailio 5.1.8 (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 with gcc 6.3.0

</code></pre>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>
<pre><code>Linux vp-balancer-dev-01 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3 (2019-02-02) x86_64 GNU/Linux
</code></pre>

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