13 Nov
2018
13 Nov
'18
3:23 p.m.
### Description
Kamailio with TOPOS enabled acts as a proxy between SIP client and SBC.
When client sends "180 Ringing" without Contact header - kamailio does not
forward it to SBC.
If Contact header exists in "180 Ringing" - all works as expected.
### Troubleshooting
#### Reproduction
Load and configure topos module
Make call with "180 Ringing" without Contact header - kamailio will not forward
it.
#### Log Messages
```
ERROR: topos [tps_storage.c:340]: tps_storage_link_msg(): bad sip message or missing
Contact hdr
```
#### SIP Traffic
```
SIP/2.0 180 Ringing
Via: SIP/2.0/TLS 1.2.3.4:5061;branch=z9hG4bKef45.8c75f0bae8a59dfaec6ff533ff0f3b2d.0
From: <sip:1111@1.2.3.4:5061>;tag=02000879948559
To: <sip:2.2.2.2@5.6.7.8:5061;transport=tls;user=phone>;tag=SDbsq8499-y2pMOVV
Call-ID: apdW7374315131g0bcGhEfDjFof
CSeq: 988207425 INVITE
User-Agent: agent
Supported: replaces, outbound
Content-Length: 0
```
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.1.6 (x86_64/linux)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, 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_LISTEN 16, MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select
```
* **Operating System**:
```
Red Hat Enterprise Linux Server 7.3
3.10.0-514.el7.x86_64 #1 SMP Wed Oct 19 11:24:13 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux
```
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