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Advanced Options for Voice Services
VoIP-to-PSTN and PSTN-to-VoIP Calling
Cisco SPA232D Administration Guide 221
C
• When using the Forward-To-GW0 feature, you can forward the caller to a
specific PSTN number, using the syntax <
PSTN-number
>@gw0 in the
forward destination. When using this with Call-Forward-Selective, you can
develop some interesting applications. For example, you can forward all
callers with 408 area code to 14081234567, or all callers with 800 area
code to 18005558355 (This is the number for Tell Me). When this syntax is
used, authentication is not used and the target PSTN number is
automatically dialed by the ATA device after the caller is forwarded to gw0.
PSTN Call to Ring Line 1
This feature allows a PSTN caller to ring Line 1. When the PSTN line rings, the
PSTN Line makes a local VoIP call to Line 1. If Line 1 is busy, it stops. After a given
number of rings, the VoIP gateway picks up the call.
Symmetric RTP
The
Symmetric RTP
parameter is used to send audio RTP to the source IP and
port of the inbound RTP packets. This facilitates NAT traversal. You can configure
these settings in the SIP Parameters section of the SIP page.
Call Progress Tones
The ATA has configurable call progress tones. Call progress tones are generated
locally on the ATA, so an end user is advised of status (such as ringback).
Parameters for each type of tone (for instance a dial tone played back to an end
user) may include the following specifications:
• Number of frequency components
• Frequency and amplitude of each component
• Cadence information
When one VoIP account is shared between the FXS and PSTN Lines, the following
parameters are recommended to be set. You can configure these settings on the
Regional page.
Call Progress Tone Description
VoIP PIN Tone This tone is played to prompt a VoIP caller to enter a PIN number.