Added hardcoded timeouts for dns operations

Ignore-this: c3532fb785b4bad0b974d9aa2d2ff04b

darcs-hash:20090819134350-1e3d8-8736bda34f4f7d343d79c6bc34898abe23edda21
Moved registration.enabled setting to sip.enable_register

Ignore-this: 2ba4c8d5c0823405b3b04957e1799164

darcs-hash:20090820064759-1e3d8-167c59b62f2c11ef300d8b17f5962e4fb3013119