In one config I use

dns_cache_flags = 4
dns_cache_init = off

Looks as when Kamailio try to resolve DNS hostname sended two DNS requests:

1. A for IPv4 address resolving;
2. AAAA for IPv6 address resolving.

When DNS hostname has only AAAA record and do not has A record, then

1. AAAA request will be successful;
2. A request will return NXDomain.

Looks as when Kamailio received NXDomain, then takes the server hostname domain and adds this part to searched DNS name and repeated request.
Example:

1. I need to send a packet to ipv6.test-ipv6.com that has only AAAA dns record.
2. Kamailio hostname proxy.example.com;
3. Kamailio send ipv6.test-ipv6.com AAAA request, successful;
4. Kamailio send ipv6.test-ipv6.com A request, NXDomain;
5. Kamailio send ipv6.test-ipv6.com.example.com AAAA request, NXDomain;
6. Kamailio send ipv6.test-ipv6.com.example.com A request, NXDomain.

Using absolute DNS name, I want Kamailio to not modify DNS name and not send extra requests.

Tested on master.

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