Fixed DNS lookup to use the correct authoritative nameservers

Ignore-this: 4a085582f61c106b6ff58b60298385e4

darcs-hash:20091221094040-1e3d8-0606a2813bc0c398fa41b3ad233c7d96ad5719a2
Fixed response handling for SIP requests

Ignore-this: ec54ac9488fac83ec3d0a43ba504c752

darcs-hash:20091221123344-1e3d8-edb5d48b57c97b3d4f2fc12cf26dc18110987f44