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SIP Alias is an alternative address for your main SIP Address. Normally, when you have a
user account for one ITSP, you have one SIP address provided by the ITSP. However, with
SIP alias, you can own multiple SIP addresses over one user account. When you register
with a regular user account, alias are registered as well as the main SIP address. Then, when
somebody dials the alias, the SIP URI bound to the alias will ring.
DID - Direct-Inward-Dial (also called DDI in Europe) is a service offered by a telephone
company that provides a block of telephone numbers associated with one phone line for
calling into a company's PBX system. The employees can have their extension numbers
respectively, and the caller, via DID function on Vigor router, can dial to any one of the
extension numbers directly without passing through auto-attendiant.
Below shows a scenario:
866668@iptel.org is the main SIP trunk set on VigorIPPBX 2820 , and
3400017904@iptel.org is set as SIP alias on VigorIPPBX 2820 as well. Both share the
same SIP account. When you complete the registration for the main SIP trunk, an additional
registration for the SIP alias will be automatically performed. Therefore, in this case, if
Benson wants to call Jacky, he has two options. One is using auto-attendant by calling
866668@iptel.org. After hearing the greeting, Benson should press the extension number
101 to call Jacky. The other is using DID by calling 3400017904@iptel.org, the call will be
forwarded to extension number 101 directly by the PBX system
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VigorIPPBX 2820 Series User's Guide
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