Configuring Voice
Configuring Voice Settings
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Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models)
6
NAT Settings
Voice > Line 1–2 > NAT Settings
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 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.