$ORIGIN ims.mnc001.mcc001.3gppnetwork.org. $TTL 1W @ 1D IN SOA localhost. root.localhost. ( 1 ; serial 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum
1D IN NS ns ns 1D IN A 10.4.128.21
pcscf 1D IN A 10.4.128.21 _sip._udp.pcscf 1D SRV 0 0 5060 pcscf _sip._tcp.pcscf 1D SRV 0 0 5060 pcscf
icscf 1D IN A 10.4.128.21 _sip._udp 1D SRV 0 0 4060 icscf _sip._tcp 1D SRV 0 0 4060 icscf
scscf 1D IN A 10.4.128.21 _sip._udp.scscf 1D SRV 0 0 6060 scscf _sip._tcp.scscf 1D SRV 0 0 6060 scscf
hss 1D IN A 10.4.128.21