Assuming the Phantom Superloop is already built, you build it like a normal 500 port but use Direct Call Forwarding.
Example:
DES Phntm
TN 240 0 00 02 PHANTOM
TYPE 500
CDEN 4D
CUST 0
ERL 00000
WRLS NO
DN 254357 0 MARP
CPND
NAME
XPLN 18
DISPLAY_FMT FIRST,LAST
AST NO
IAPG 0
HUNT
TGAR 1
LDN NO
NCOS 0
SGRP 0
RNPG 0
XLST
SCI 0
SCPW
CLS CTD DTN FBD XFD WTA THFD FND HTD ONS
LPR XRD AGRD CWD SWD MWD RMMD SMWD LPD XHD SLKD CCSD LND TVD
CFTD SFD MRD C6D CNID CLBD AUTU
ICDA CDMA LLCN EHTD MCTD
GPUD DPUD CFXD ARHD OVDD AGTD CLTD LDTD ASCD SDND
MBXD CPFA CPTA DDGA NAMA MIND
MCRD
EXR0 SHL ABDD CFHD DNDY DNO3
CWND USMD USRD BNRD OCBD RTDD RBDD RBHD FAXD CNUD CNAD PGND FTTC
CDMR PRED MCDD T87D PKCH MPTD
PLEV 02
PUID
AACS NO
MLWU_LANG 0
FTR DCFW 4 6990
DATE 1 JUN 2012