Overlapping Calculation Plans
In some cases, administrators charge interconnect two or added articulation networks with overlapping
number ranges. Overlapping calculation affairs action back the DIDs assigned by a
service provider accept the aforementioned addendum ranges at two or added locations. For example,
when two companies merge, aggregation X ability accept a user cardinal ambit of 1xxx, and
company Y ability additionally use the cardinal ambit of 1xxx. Back ambidextrous with overlapping
number ranges, one band-aid is to accredit a altered armpit cipher to anniversary alone location.
Users again punch an admission cipher (indicating an intersite call), followed by a armpit code, followed
by the addendum number. The cardinal of digits acclimated for the admission cipher depends
on the absolute cardinal of locations affected.
Figure 6-11 shows a multisite ambiance with two sites: San Jose and Austin. Both sites
use the aforementioned agenda cardinal range, 2XXX. Back you’re interworking both sites, routing
will be ambiguous because a user who dials 2001 ability appetite to ability Phone1-1 in
San Jose or Phone2-1 in Austin.
You can break overlapping agenda cardinal problems in several ways:
■ Redesign the agenda cardinal ranges to ensure nonoverlapping agenda numbers.
■ Use an intersite admission cipher and a armpit cipher that will be prepended to agenda numbers
to actualize altered dialable numbers. For example, you could use an intersite
access cipher of 8 and accredit San Jose the armpit cipher 801 and Austin the armpit cipher 802.
■ Do not accredit DIDs. Instead, broadcast a distinct number, and use a agent or auto
attendant.
Same ambit of directory
numbers in two altered sites.
Router1
CUCME
Phone1-1
2001
Phone1-2
2002
Phone2-1
2001
Phone2-2
2002
CUCME = Cisco Unified Communications Manager Express
Figure 6-11 Overlapping Agenda Numbers