Cisco UC500 series Configuration Manual page 33

4.3.23 Now click on Configure button next to Direct Inward Dial (DID). Clicking on that
button launches another pop up which is for
1. One to One DID translation – which is direct mapping between external PSTN
number and internal extension
2. Many to One DID translation – which is mapping multiple external PSTN numbers to
a single internal extension (say operator)
This example goes over configuring the DIDs for 2 extensions as below
Click on Add range for "One-to-One DID Translation"
Enter a description such as SIP
Enter DID range start as 4085551201 and end as 4085551202
Enter Internal Number Extension start as 201 and end as 202
Choose SIP Trunk from the trunk pulldown
Do not Check Caller ID and then click OK
Figure 4.3.23 DID Configuration
Note 1: The following are the rules for implementation of caller-id in CCA1.5:
1. If the caller-id check box is selected and the last few digits of the extension match that of the DID, then the
outbound number would be the DID configured as above.
2. If the caller-id check box is selected and the last few digits of the extension DONOT match that of the DID, then an
error is shown. The workaround is not check the box.
3. If caller-id check box is not selected, outbound caller ID for all calls would be the AA PSTN number.
4. For any internal extension without a DID mapped to it, outbound caller ID would be AA PSTN number
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DID configuration. This has 2 sections:
1
.