194.2.188

Sofia SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification.

$ORIGIN 188.2.194.in-addr.arpa.
$TTL     60
@ 	 IN SOA ns root (
	     2002042901 ; SERIAL
	     7200       ; REFRESH
	     600        ; RETRY
	     36000000   ; EXPIRE
	     120        ; MINIMUM
	     )
	       	
	    NS	 ns.example.com.

133	    PTR  sip00.example.com.