CDPD: Inter-Area Cell Transfer
starts out identical to intra-area cell transfer
once M-ES synchronized with new channel, mobile
sends “end system hello” (ESH) to new serving MD-IS
ESH informs MD-IS of presence of M-ES, register its
address (NEI)
new serving MD-IS sends message to home MD-IS to
tell it where data for M-ES should be redirected
home MD-IS acknowledges if registration is successful
new serving MD-IS confirms successful registration to
M-ES
home MD-IS “flushes” previous serving MD-IS, telling
it that messages are no longer forwarded for this M-ES