3.f.f.e.1.2.0.0.3.0.1.2.c.0.0.0

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

$ORIGIN 0.0.0.c.2.1.0.3.0.0.2.1.e.f.f.3.ip6.int.
$TTL     60
@ 	 IN SOA ns root (
	     2002042901 ; SERIAL
	     7200       ; REFRESH
	     600        ; RETRY
	     36000000   ; EXPIRE
	     120        ; MINIMUM
	     )
	       	
	    NS	 ns.example.com.

c.a.7.e.d.7.e.f.f.f.0.2.8.0.a.0 PTR  sip01.example.com.