[kamailio/kamailio] TOPOS module does not strip Via headers from ACK and BYE. (#1926) - sr-dev

11 Apr 2019

### Description
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. 

See Sip Traffic section for details.

#### SIP Traffic
```
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

```

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
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

```

* **Operating System**:
```
Linux vp-balancer-dev-01 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3 (2019-02-02) x86_64
GNU/Linux
```

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https://github.com/kamailio/kamailio/issues/1926