Binod explained (with an example) about 2 new records related to SIP -
i) New Naming Authority Pointer (NAPTR) Record as a mechanism to specify protocol (TCP/UDP)
ii) Service Record (SRV) as locating server host and port from SailFin. Also Binod provided clear steps for configuring DNS on SailFin server.
Check the details at Locating SIP servers using DNS in SailFin
Check the details at Locating SIP servers using DNS in SailFin