User's Manual

Chapter 8 PBX Tutorials
ISG50 User’s Guide
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• If you want outsiders to dial in directly to extensions without going through the Auto-Attendant,
follow the instructions until step 2, select DDI/DID and configure the settings as following.
In the DDI/DID Mapping Setting section, define DDI/DID Mask (the digits of the Directory
Number on the right) for extension mappings. For example, you define 4 for the DDI/DID Mask
and add 1001 to 1001 for the mapping rule. So an incoming call to 8005551001 will be
forwarded to the extension.
8.6.2 Example 2: Company with Existing PBX
For a company which already has a PBX. The ISG50 is deployed between the PBX and the telephone
service provider. You can connect the ISG50 to the telephone service provider using PSTN
connection (see Section 8.3 on page 143) or ISDN (see Section 8.5 on page 154).
If you want the callers from the PBX’s extensions not to go through the Auto-Attendant, select one
of the following settings and continue the other settings according the instruction.