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911 ANI


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whats the difference with EPID and the ANI for emergency calls?


The EPID is a special DID number assigned by the PBX that can be used to call the extension back immediately from the emergency call center. This is essentially to bypass the auto attendant and go directly to the extension that placed a E911 call. This is something that you cannot do with a TDM system (a benefit of using VoIP for emergency calls!). However the E911 call center needs to support this.


The ANI is dealing with the question what caller-ID you want to present when calling the E911 call center. In some cases, this must be a different number than for regular calls. Especially when the call center has location-based information associated with the caller-ID, it makes sense to explicitly enter this ANI.

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