Description

  1. Added 3 gateways to the dispatcher list file:
1 sip:naptr.mydomain.net 0 0
2 sip:srv.mydomain.net 0 0

started kamailio and ran: kamcmd dispatcher.list
Output: error: 500 - No Destination Sets
If I append to the list, one gateway which resolves to an A record (or an IP:PORT format) like e.g.:
3 sip:a.mydomain.net:5060 0 0, it shows up in the dispatcher list just fine:

{
        NRSETS: 1
        RECORDS: {
                SET: {
                        ID: 3
                        TARGETS: {
                                DEST: {
                                        URI: sip:a.mydomain.net:5060
                                        FLAGS: AP
                                        PRIORITY: 0
                                        LATENCY: {
                                                AVG: 14.642
                                                STD: 0.05
                                                EST: 15.0345
                                                MAX: 25.452
                                                TIMEOUT: 0
                                        }
                                }
                        }
                }
        }
}

I also verified the DNS resolution with: kamcmd dns.lookup naptr naptr.mydomain.net and kamcmd dns.lookup srv srv.mydomain.net which was perfectly as expected.

Since I wasn't even able to see a dispatcher loaded, there was no operation that I could do to it to set it to active or anything else.

A network trace just shows A record queries to all gateways with no success on those which have NAPTR/SRV records.

Reproduction

100% reproducible with the description above.

Additional Information

Tested on Kamailio version 4.4.5 and 5.1.1 with the following detailed version info:

version: kamailio 5.1.1 (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.
compiled with /usr/bin/gcc 4.1.2


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