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Setting the advertise parameter of the listen option in kamailio.cfg has no effect on the Via address sent by the UAC module. I expected the Via header to contain the public IP. Instead, the REGISTER requests sent by the UAC module continue to use the private ip:
listen=<private ip>:5060 advertise <public ip>:5060
Via: SIP/2.0/UDP <private ip>:5060;branch=z9hG4bK6c7b.fc053184000000000000000000000000.0
This is confusing since the core cookbook recommends against using advertised_address.
With the advertised_address option, the IP in the Via header is set to the public IP address as expected:
advertised_address=<public ip>:5060
listen=<private ip>:5060
Via: SIP/2.0/UDP <public ip>:5060;branch=z9hG4bK45ba.c2851fa6000000000000000000000000.0
kamailio -vversion: kamailio 5.2.3 (x86_64/linux) c36229
flags: STATS: Off, USE_TCP, USE_TLS, 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: c36229
compiled on 13:25:11 Jun 2 2019 with gcc 8.3.0
Linux linux 5.1.5-gentoo #1 SMP PREEMPT Mon May 27 14:42:14 CEST 2019 x86_64 AMD A6-3670 APU with Radeon(tm) HD Graphics AuthenticAMD GNU/Linux
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