1. Find and assign an
endpoint for an
incoming call request
(PSTN: lookup by CAPI
controller number; SIP:
lookup by "From"
address of received
message).
2. Go sequentially through
the list of routes and
find the first route that
has this endpoint
defined in its configured
sources list.
3. Determine whether at
least one call address
condition of this route
matches simultaneously
the called, calling, and
redirected addresses of
the call request; if not,
find another route.
4. If any route condition
matches, verify in the
list of configured
destinations which one
is the most preferred.
This is done based on
settings. See
Information about Call
Processing below for
more information.
5. Try to establish the call
via this destination. If
the destination is
unavailable or rejects
the call, try the next
destination of the route.
Note that the call will be
aborted immediately if a
cause code is received
that signals final failure,
e.g., user busy or
unallocated number.
6. The call is established.
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