Configuring Destination Arrangement Options
The destination arrangement you configure is acclimated to bout dialed digits to a punch peer. The
dial associate is again acclimated to complete the call.
When a router receives articulation data, it compares the alleged cardinal (the abounding E.164 telephone
number) in the packet attack with the cardinal configured as the destination pattern
for the voice-telephony peer. It additionally determines the dialed digits the router collects
and assiduously to the alien telephony interface, such as a PBX, Cisco Unified
Communications Manager, or the PSTN.
To specify either the prefix or the abounding E.164 blast cardinal to be acclimated for a punch peer,
use the destination-pattern command in punch associate agreement mode, which has the following
syntax:
destination-pattern [+] cord [T]
Destination-pattern options accommodate the following:
■ Additional assurance (+): An alternative appearance that indicates an E.164 accepted number. E.164 is
the All-embracing Telecommunication Union Telecommunication Standardization sector
(ITU-T) advocacy for the all-embracing attainable telecommunication numbering
plan. The additional assurance in advanced of a destination-pattern cord specifies that the string
must accommodate to E.164.
■ string: A alternation of digits allegorical the E.164 or clandestine dial-plan blast number.
The afterward examples appearance the use of appropriate characters generally begin in destination
pattern strings:
■ Asterisk (*) and batter assurance (#): An asterisk (*) and batter assurance (#) arise on
standard touch-tone punch pads. These characters ability charge to be acclimated when
passing a alarm to an automatic appliance that requires these characters to signal
the use of a appropriate feature. For example, back calling an alternate voice
response (IVR) arrangement that requires a cipher for access, the cardinal dialed might
be 5551212888#, which would initially punch the blast cardinal 5551212 and
input a cipher of 888 followed by the batter key to abolish the IVR ascribe query.
■ Breach (,): A breach (,) inserts a one-second abeyance amid digits. The comma
can be used, for example, area a 9 is dialed to arresting a PBX that the alarm should
be candy by the PSTN. The 9 is followed by a breach to accord the PBX time
to attainable a alarm aisle to the PSTN, afterwards which the actual digits are played out.
An archetype of this cord is 9,5551212.
■ Aeon (.): A aeon (.) matches any distinct entered chiffre from 0 to 9 and is acclimated as
a wildcard. The wildcard can be acclimated to specify a accumulation of numbers that might
be attainable via a distinct destination router, gateway, PBX, or Cisco Unified
Communications Manager. A arrangement of 200. allows for ten abnormally addressed
devices, admitting a arrangement of 20.. can point to 100 devices. If one armpit has the
numbers 2000 through 2049 and addition armpit has the numbers 2050 through
2099, a bracket characters would be added efficient, as declared next.
Chapter 3: Routing Calls over Analog Articulation Ports 173
Note In the case of POTS punch peers, the router strips out the left-justified numbers that
explicitly bout the destination pattern. If you accept configured a prefix (using the prefix
digits command), the prefix is added to the advanced of the actual numbers, creating a
dial string, which the router again dials. If all numbers in the destination arrangement are
stripped out, the user receives a punch tone.
■ Brackets ([ ]): Brackets ([ ]) announce a range. A ambit is a arrangement of characters
enclosed in the brackets. Only distinct numeric characters from 0 through 9 are
allowed in the range. In the antecedent example, the bracket characters could be used
to specify absolutely which ambit of numbers is attainable through anniversary punch peer.
For example, the arrangement of 20[0–4]. would be acclimated for the aboriginal site, and a pattern
of 20[5–9]. would be acclimated for the additional site. Note that in both cases, a dot
is acclimated in the aftermost chiffre position to represent any distinct chiffre from 0 through 9.
The bracket characters offers abundant added adaptability in how numbers can be
assigned.
■ T: An alternative ascendancy appearance advertence that the destination-pattern amount is a
variable-length punch string. In cases area callers ability be dialing local, national, or
international numbers, the destination arrangement charge accommodate for a variable-length dial
plan. If a accurate articulation aperture has admission to the PSTN for bounded calls and access
to a across affiliation for all-embracing calls, calls actuality baffled to that gateway
have a capricious cardinal of dialed digits. A distinct punch associate with a destination pattern
of .T could abutment the altered alarm types. The interdigit abeyance determines
when a cord of dialed digits is complete. The router continues to aggregate digits until
there is an interdigit abeyance best than the configured value, which by absence is
10 seconds.
■ However, the calling affair can anon abolish the interdigit abeyance by entering
the batter appearance (#), which is the absence abortion character. Because the
default interdigit timer is set to 10 seconds, users ability acquaintance a connected call-setup
delay.
174 Authorized Self-Study Guide: Cisco Articulation over IP (CVOICE)
Note Cisco IOS Software does not analysis the authority of the E.164 blast number. It
accepts any alternation of digits as a accurate number.
Table 3-8 demonstrates the use of assorted destination arrangement wildcards, including the
period, brackets, and the .T wildcards.
Table 3-8 Destination Arrangement Options
Destination Arrangement Matching Blast Numbers
5550124 Matches one blast cardinal exactly, 5550124.
This is about acclimated back a distinct device, such as a blast or
fax, is affiliated to a articulation port.
Table 3-8 Destination Arrangement Options (continued)
Destination Arrangement Matching Blast Numbers
55501[1-3]. Matches a seven-digit blast cardinal area the aboriginal bristles digits
are 55501. The sixth chiffre can be a 1, 2, or 3, and the aftermost chiffre can
be any accurate digit.
This blazon of destination arrangement is acclimated back blast number
ranges are assigned to specific sites. In this example, the destination
pattern is acclimated in a baby armpit that does not charge added than 30 numbers
assigned.
.T Matches any blast cardinal that has at atomic one chiffre and can
vary in breadth from 1 through 32 digits total.
This destination arrangement is acclimated for a punch associate that casework a
variable-length punch plan, such as local, national, and international
calls. It can additionally be acclimated as a absence destination arrangement so any calls
that do not bout a added specific arrangement will bout this pattern
and can be directed to an operator.