Why a different number may appear when you fax from a toll-free line
Understand the calling number and fax station identifier shown to recipients.
A WestFax toll-free fax line may use an associated local number for outgoing calls. This calling number is known as ANI.
Using a local calling number can help with delivery to systems that restrict calls between toll-free numbers.
The receiving system may display two different identifiers:
- ANI: The calling number used for the fax connection.
- CSID: The fax station identifier configured for your fax line.
Because these serve different purposes, the numbers displayed by the receiving system may not match.
If a recipient asks about an unfamiliar number, let us know your WestFax fax number and the number they see. We can confirm the assigned ANI and how return faxes to that number are routed.