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The advertise option in a listen parameter seems to only allow the following syntax:
advertise ip_or_host:port
The advertise ip_or_host syntax is not allowed and gives the following error:
CRITICAL: [core/cfg.y:3507]: yyerror_at(): parse error in config file /etc/kamailio/kamailio.cfg, line 49, column 1-6: ip address, interface name or hostname expected
This can be blocking when using DNS SRV features in order to retrieve both host and port to send the SIP messages: when a port is present in the record-route/via headers no DNS SRV are done.
So it prevents from doing some DNS-based load-balancing / failover things.
We get the same behaviour with using the deprecated advertised_address parameter: default port is set by Kamailio (because it is not possible to force a null value for advertised_port) in the Via header (but does not seem to affect the R-R header).
The advertised address can only be forced for the Record-Route header using the record_route_advertised_address function in the script.
Tested with last Kamailio release on Debian 9.8
version: kamailio 5.2.1 (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
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