ATCOM IPPBX IP08 - Interconnecting IP PBX Systems via Service Providers; Creating Service Providers for Inter-PBX Connectivity

IPPBX IP08 User Manual
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4.4 Make inbound calls
Go to PBX Settings -> Inbound Routes, click to add an inbound route.
1) General
Caller ID
Define the Caller ID number to be matched on incoming calls. Leave this field blank to match any or no CID info.
Special characters described in chapter 4.3 can be used here as same.
DID number
Define the expected DID number if your trunk passes DID on incoming calls. Leave this blank to match calls with
any no DID info. The DID for SIP trunk is usually as same as the account (others can only dial the account
number to dial into PBX), then just leave it blank is OK .
Extension