gedia created an issue (kamailio/kamailio#4242)

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

See description

Possible Solutions

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:

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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