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

Thu Apr 11 17:25:03 CEST 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 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 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 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 10.164.0.10:5060>;tag=242182414738912437015910463786
Call-ID: cce13277-d70b-1237-a6b5-42010aa60002
Contact: <sip:gw+kamailio at 35.204.224.219:5060;gw=kamailio;transport=udp>
CSeq: 2943281 ACK
Content-Length: 0

BYE sip:79200204544 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 35.228.92.211>;tag=S2363F7Qt7eNr
To: <sip:79200204544 at 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 at 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
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