Information Technology Reference
In-Depth Information
FXS 0/0/0
x1101
FXS 0/0/1
CME_A
x1102
Figure 6-8
PLAR Configuration
Example 6-13
FXS PLAR Configuration
Key
To p i c
CME_A(config)# voice-port 0/0/0
CME_A(config-voiceport)# connection ?
plar Private Line Auto Ringdown
tie-line A tie line
trunk A Straight Tie Line
CME_A(config-voiceport)# connection plar ?
WORD A string of digits including wild cards
tied dedicated tie to this number
CME_A(config-voiceport)# connection plar 1102
The FXS voice port 0/0/0 is now hard-coded to dial the number 1102 as soon as a user
lifts the handset.
PLAR can also be useful in a variety of other circumstances. One common scenario is
using FXO connections to the PSTN, as shown in Figure 6-9.
Receptionist
x1500
FXO 2/0/0
PSTN
FXO 2/0/1
V
CME_A
Figure 6-9
FXO PSTN Connections
Although the destination-pattern command from dial peer configuration mode is useful
for dictating what can go out the PSTN FXO ports, it is not too useful for handling what
comes in the FXO ports. When the CME_A router shown in Figure 6-9 receives an incom-
ing call from the PSTN, the call information sent from the PSTN carrier does not include
dialed number information. (This is known as Dialed Number Identification Service
[DNIS].) It includes caller ID information (known as Automatic Number Identification
[ANI]), but this does not help the router to know where to send the call when it is received.
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