Hi, Here's what I've noticed when started to use DNS SRV features of pjsua- lib. If the registrar does not have SRV records, resolving of A record fails. 01:39:20.191 resolver.c Transmitting 37 bytes to NS 0 (192.168.1.1:53): DNS SRV query for _sip._udp.cubio.net 01:39:22.192 resolver.c Re-transmitting 37 bytes to NS 0 (192.168.1.1:53): DNS SRV query for _sip._udp.cubio.net 01:39:24.191 resolver.c Re-transmitting 37 bytes to NS 0 (192.168.1.1:53): DNS SRV query for _sip._udp.cubio.net 01:39:26.187 _sip._udp.cubi DNS SRV resolution failed for _sip._udp.cubio.net: DNS "Server failure" (PJLIB_UTIL_EDNS_SERVFAIL) 01:39:26.187 _sip._udp.cubi DNS SRV resolution failed for _sip._udp.cubio.net, trying resolving A record for cubio.net 01:39:26.187 _sip._udp.cubi DNS A record resolution error for 'cubio.net'. Err=320046 (No working DNS nameserver (PJLIB_UTIL_EDNSNOWORKINGNS)) 01:39:26.187 sip_resolve.c DNS A record resolution failed: No working DNS nameserver (PJLIB_UTIL_EDNSNOWORKINGNS) 01:39:26.187 tsx0x8ac064 Failed to send Request msg REGISTER/ cseq=15062 (tdta0x8eac00)! err=320046 (No working DNS nameserver (PJLIB_UTIL_EDNSNOWORKINGNS)) 01:39:26.187 pjsua_acc.c SIP registration failed, status=503 (Service Unavailable) And here are two dig outputs for the same computer and DNS server (it can resolve A record for cubio.net). $ dig _sip._udp.cubio.net srv ; <<>> DiG 9.4.2-P2 <<>> _sip._udp.cubio.net srv ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 42530 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;_sip._udp.cubio.net. IN SRV ;; Query time: 4393 msec ;; SERVER: 192.168.1.1#53(192.168.1.1) ;; WHEN: Wed Feb 4 01:46:52 2009 ;; MSG SIZE rcvd: 37 $ dig cubio.net ; <<>> DiG 9.4.2-P2 <<>> cubio.net ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16101 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3 ;; QUESTION SECTION: ;cubio.net. IN A ;; ANSWER SECTION: cubio.net. 3600 IN A 81.29.134.11 ;; AUTHORITY SECTION: cubio.net. 3600 IN NS ns3.cubio.net. cubio.net. 3600 IN NS ns1.cubio.net. cubio.net. 3600 IN NS ns2.cubio.net. ;; ADDITIONAL SECTION: ns1.cubio.net. 3094 IN A 81.29.128.1 ns2.cubio.net. 3094 IN A 81.29.128.2 ns3.cubio.net. 3094 IN A 81.29.129.125 ;; Query time: 58 msec ;; SERVER: 192.168.1.1#53(192.168.1.1) ;; WHEN: Wed Feb 4 01:47:07 2009 ;; MSG SIZE rcvd: 145 Alexei
