Name: Cisco SPA2102
Brand: Cisco
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Configuring the PSTN (FXO) Gateway on the SPA3102

How VoIP-To-PSTN Calls Work

Cisco Small Business ATA Administration Guide 89

Two-Stage Dialing (SPA3102)

In two-stage dialing, the SPA3102 takes the FXO port off-hook but does not

automatically dial any digits after accepting the call. To invoke two-stage dialing,

the VoIP caller should INVITE the PSTN Line without the user-id in the Request-URI

or with a user-id that matches exactly the < n> of the PSTN Line. A different

user-id in the Request-URI is treated as a request for one-stage dialing if one-

stage dialing is enabled, or dropped by the SPA3102 (as if no user-id is given) if

one-stage dialing is disabled.

HTTP Digest Authentication can be also used for two-stage dialing, as in one-

stage dialing. If using HTTP Digest Authentication or Authentication is disabled, the

VoIP caller should hear the PSTN dial tone right after the call is answered (by a SIP

200 response).

You also can enable PIN authentication. In this case, the VoIP caller is prompted to

enter a PIN number after the SPA3102 answers the call. The PIN number must end

with a # key. The inter-PIN-digit timeout is 10 seconds (not configurable). Up to

eight VoIP caller PIN numbers can be configured on the SPA3102. A dial plan can

be selected for each PIN number. If the caller enters a wrong PIN or the SPA3102

times out waiting for more PIN digits, the SPA3102 tears down the call

immediately with a BYE request.

The call scenarios may involve the following types of callers:

 VoIP callerSomeone who calls the ATA device via VoIP to obtain PSTN

service

 VoIP userA VoIP caller that has a user account (user-id and password) on the

SPA3102

 PSTN callerSomeone who calls the ATA device from the PSTN to obtain VoIP

service

VoIP callers can be authenticated by one of the following methods:

 No AuthenticationAll callers are accepted for service.

 PINCaller is prompted to enter a PIN right after the call is answered.

 HTTP digestSIP INVITE must contain a valid authorization header.

PSTN callers can be authenticated by one of the following methods:

 No authenticationAll callers are accepted for service.

 PINCaller is prompted to enter a PIN right after the call is answered.

Cisco SPA2102 User Manual

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