gedia created an issue (kamailio/kamailio#4242)
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### Description
This is definitely not high priority, just a nuisance when auditing logs for
actionable events.
The following is logged (see Log Messages section below) on edge proxies when
the outbound module is loaded and the REGISTER contains:
```
Contact: *
Expires: 0
```
AFAIK this is legit when a UAC asks that all their contacts be removed from the
location database.
### Troubleshooting
#### Reproduction
Force a UAC to send an unREGISTER towards an outbound-capable kamailio edge
proxy.
#### Log Messages
```
outbound [outbound_mod.c:325]: use_outbound_register(): empty Contact:
```
#### SIP Traffic
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See description
### Possible Solutions
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I'm not sure what the best approach would be here, but I'm thinking one of the
following:
* Either handle this case gracefully (contact is * in REGISTER with Expires=0),
without logging anything, unless there's some misbehaviour here by the UAC I'm
not aware of regarding outbound and unREGISTER behaviour
* Or, log this in a more verbose level (e.g. debug), when contact parsing fails
due to it being set to '*'
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.8.6 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, 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_BLOCKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_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 10.2.1
```
* **Operating System**:
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```
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
Linux lbpub0-tis0-cn1 5.10.0-21-amd64 #1 SMP Debian 5.10.162-1 (2023-01-21)
x86_64 GNU/Linux
```
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