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Ext SIP Port
Ext RTP Port Min
NAT Mapping Enable
NAT Keep Alive Enable
NAT Keep Alive Msg
NAT Keep Alive Dest
Use Outbound Proxy
Outbound Proxy
Use OB Proxy In Dialog
NAT Keep Alive Intvl
4.6.
Media and SDP (Session Description Protocol) Configuration
4.6.1.
DTMF and Hookflash
By default, the PHONE ADAPTER sends DTMF to the far end using RFC2833-style "AVT tones".
This method of conveying DTMF tones sends a representation of a tone (someone pressed the "7"
key) to the RTP peer as a separate RTP audio codec, but with timing information synchronized with
the speech audio codec. This method of DTMF conveyance works in most topologies, however in
some environments, the service provider may have an application server which is not in the media
path, or may be responsible for protocol conversion to a protocol or device which does not support
AVT tones.
Likewise, hookflash events by default are handled internally by the PHONE ADAPTER and used to
trigger supplementary services which are implemented on the PHONE ADAPTER. If a provider needs
to convey a hookflash event to an application server to initiate a network-oriented feature, the
PHONE ADAPTER is configurable to send these events.
© 2004 Linksys Proprietary (See Copyright Notice on Page 2)
External port to substitute for the actual SIP port of
the unit in all outgoing SIP messages. If "0" is
specified, no SIP port substitution is performed.
External port mapping of <RTP Port Min>. If this
value is non-zero, the RTP port number in all
outgoing SIP messages is substituted by the
corresponding port value in the external RTP port
range.
Enable the use of externally mapped of IP address
and SIP/RTP ports in SIP messages. The mapping
may be discovered by any of the supported
methods.
If set to "yes", the configured <NAT Keep Alive
Msg> is sent periodically every <NAT Keep Alive
Intvl> seconds.
Contents of the keep-alive message to be sent to a
given destination periodically to maintain the
current NAT-mapping. It could be an empty string. If
value is $NOTIFY, a NOTIFY message is sent as
keep alive. If value is $REGISTER, a REGISTER
message w/o Contact is sent.
Destination to send NAT keep alive messages to. If
value is $PROXY, it will be sent to the current proxy
or outbound proxy
Enable the use of <Outbound Proxy>. If set to "no",
<Outbound Proxy> and <Use OB Proxy in Dialog)
is ignored.
SIP Outbound Proxy Server where all outbound
requests are sent as the first hop.
Whether to force SIP requests to be sent to the
outbound proxy within a dialog. Ignored if <Use
Outbound Proxy> is "no" or <Outbound Proxy> is
empty
Interval between sending NAT-mapping keep alive
message in sec
Port
0
Port
0
Bool
No
Bool
No
Str31
$NOTIFY
FQDN
$PROXY
Bool
No
FQDN
No
Bool
Yes
Uns16
15
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