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Call Scenarios
Cisco SPA232D Administration Guide 224
C
If the credentials are correct, the target number specified in the user-id field of the
INVITE Request-URI is processed by the dial plan corresponding to the VoIP user
(assuming the dial plan choice is not 0). The final number is then auto-dialed by the
ATA device.
If the credentials are incorrect, the ATA device challenges the INVITE again. If the
auth-ID does not exist in the ATA device configuration, the ATA device replies 403
to the INVITE. If the target number is invalid according to the corresponding dial
plan, the ATA device also replies 403 to the INVITE. Again, if the PSTN Line is busy
at the time of the call, the ATA device replies 503.
NOTE HTTP Digest Authentication is one way to perform one-stage dialing of a VoIP-To-
PSTN call. The other way is with no authentication require. However, if the target
number is not specified in the Request-URI or the number matches the account
user-id of the PSTN Line, the call reverts to two-stage dialing.
Without Authentication
This scenario can also be implemented without authentication, using one-stage or
two-stage dialing, as in the HTTP Authentication case. The default VoIP caller dial
plan is used in this scenario. Authentication is performed when the method is none
or when the source IP address of the inbound INVITE matches one of the
VoIP
Access List
patterns.
Call Forwarding to PSTN Gateway
This section describes a number of scenarios that forward calls to the PSTN
gateway. It includes the following topics:
• Forward-On-No-Answer to the PSTN Gateway
• Forward-All to the PSTN gateway
• Forward to a Particular PSTN Number
• Forward-On-Busy to PSTN Gateway or Number
You can configure Call Forward settings on the User 1 page.
Forward-On-No-Answer to the PSTN Gateway
In this scenario, Line 1 is configured to
Cfwd No Ans Dest
to the PSTN Gateway.
The scenario is implemented by setting User 1 to forward to gw0 on no answer,
with
Cfwd No Ans Delay
set to six seconds.