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Configuring the PSTN (FXO) Gateway on the SPA3102
Other Options
ATA Administration Guide 104
6
Other Options
This section describes other options provided by the ATA device. It includes the
following topics:
• ”PSTN Call to Ring Line 1” section on page104
• ”Symmetric RTP” section on page104
• ”Call Progress Tones” section on page105
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.
The following table lists symmetric RTP parameters.
Parameter Web
Page
Description Value
Symmetric RTP Line 1 Enable symmetric RTP operation. If enabled,
the ATA device sends RTP packets to the
source address of the last received valid
inbound RTP packet. If disabled, the ATA
device sends RTP to the destination as
indicated in the inbound SDP.
Yes or
No
The
default is
yes.
Symmetric RTP PSTN
Line
Same as above for the PSTN line. Yes or
No
The
default is
yes.