You administer a VoIP network in the United States.
You configure two search spaces for your organization. The Local search space contains only the LocalPT
partition, which can match only four-digit local dns. The LongDistance search space contains the PSTNPT,
which can match patterns up to 12 digits in length.
You configure an IP phone that has been assigned the dn 5555 to use the Local search space. You also
disable call forwarding on the IP phone.
Upon reviewing call logs, you discover that long distance calls have been made from the IP phone that has
been assigned the dn 5555.
Which of the following can cause this problem? (Choose two.)
A.
A long distance route pattern match exists in the <None> search space.
B.
A long distance route pattern match exists in the Local search space.
C.
The Local search space has been assigned as a line search space.
D.
The Local search space has been assigned as a device search space.
E.
The Local search space is able to match too many digits.
F.
The Local search space is able to reach the PSTN.
G.
The LongDistance search space does not match enough digits.
H.
The LongDistance search space has been assigned as a line search space.
Explanation:
Long distance calls can be made from the IP phone that has been assigned the directory number (dn) 5555 if a
long distance route pattern match exists in the <None> search space. In addition, long distance calls can be
made from the IP phone if the LongDistance search space has been assigned as a line search space. A search
space is an ordered list of partitions that a device is allowed to search in order to locate patterns that match a
dialed number. A partition is a logical grouping of Voice over IP (VoIP) route patterns and dns. A device that is
not able to match a dialed number in any of the search spaces that are assigned to the device will generate a
busy signal.
By default, every VoIP endpoint can match a route pattern or dn that is contained within the <None> search
space. The <None> search space contains the <None> partition. The <None> partition initially contains all the
dns that are configured in the VoIP network. Therefore, you should move dns from the <None> partition to a
custom partition to limit specific pattern matching to specific endpoints. In this scenario, the IP phone at 5555
will be able to call long distance numbers if a pattern that matches long distance numbers is matched in the
<None> search space.
There are two types of search spaces that a VoIP device can search: a device search space and a line search
space. A device search space is a search space that is assigned to a device itself. The information in a device
search space will be searched no matter which line on a device is chosen for the outgoing call. A line search
space, on the other hand, is a search space that is assigned to a single line on a device, not to the device itself.
The information in a line search space will be searched when the user chooses the line to which the search
space is assigned as the outgoing line for the call.
If a device is configured with both a device search space and a line search space, the device will combine the
two search spaces together, with the line search space taking precedence. Thus the information contained in
the line search space will be searched first. In this scenario, if you assign the Local search space to the IPphone itself and the LongDistance search space to a line on the IP phone, the LongDistance search space will
be searched first and a user will be allowed to make long distance calls from the IP phone. Cisco recommends
configuring calling search spaces at the device level to prevent users from bypassing calling restrictions by
simply placing calls from an alternate phone line.
It is not likely that the Local search space assignment or configuration can cause the problem. In this scenario,
the Local search space contains only the LocalPT partition, which in turn can only match patterns that are four
digits in length. In order for the Local search space to match a long distance pattern or reach the public
switched telephone network (PSTN), the partition would need to be able to match more than four digits. In
addition, the Local search space could be assigned as either a device search space or a line search space in
this scenario.
It is not likely that the number of digits being matched by the LongDistance search space can cause the
problem. In this scenario, the LongDistance search space contains the PSTNPT partition, which can match up
to 12 digits. A typical long distance telephone number in the United States contains 11 digits, although you
might be required to dial an additional digit at the beginning of the dial string to access the PSTN.Cisco: Partitions and Calling Search Spaces: Understanding Partitions and Calling Search Spaces