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ATA Voice Field Reference
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ATA Administration Guide 167
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NAT Settings section
SAS Inbound RTP
Sink
This setting works around devices that do not play inbound
RTP if the streaming audio server line declares itself as a
send-only device and tells the client not to stream out
audio. Enter a Fully Qualified Domain Name (FQDN) or IP
address of an RTP sink; this value is used by the streaming
audio server line in the SDP of its 200 response to an
inbound INVITE message from a client.
The purpose of this parameter is to work around devices
that do not play inbound RTP if the SAS line declares itself
as a send-only device and tells the client not to stream out
audio. This parameter is a FQDN or IP address of a RTP
sink to be used by the SPA SAS line in the SDP of its 200
response to inbound INVITE from a client. It will appear in
the c = line and the port number and, if specified, in the m =
line of the SDP. If this value is not specified or equal to 0,
then c = 0.0.0.0 and a=sendonly will be used in the SDP to
tell the SAS client to not to send any RTP to this SAS line. If
a non-zero value is specified, then a=sendrecv and the
SAS client will stream audio to the given address. Special
case: If the value is $IP, then the SAS line’s own IP address
is used in the c = line and a=sendrecv. In that case the SAS
client will stream RTP packets to the SAS line.
The default value is empty.
NAT Mapping
Enable
To use externally mapped IP addresses and SIP/RTP ports
in SIP messages, select yes. Otherwise, select no.
The default is no.
NAT Keep Alive
Enable
To send the configured NAT keep alive message
periodically, select yes. Otherwise, select no.
The default is no.
NAT Keep Alive
Msg
Enter the keep alive message that should be sent
periodically to maintain the current NAT mapping. If the
value is $NOTIFY, a NOTIFY message is sent. If the value is
$REGISTER, a REGISTER message without contact is sent.
The default is $NOTIFY.