Cisco IP Phone 6851

NAT Settings
DescriptionParameter
To use externally mapped IP addresses and SIP/ RTP ports in SIP
messages, select yes. Otherwise, select no.
Default: No
NAT Mapping Enable
To send the configured NAT keep alive message periodically, select
yes. Otherwise, select no.
Default: No
NAT Keep Alive Enable
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.
Default: $NOTIFY
NAT Keep Alive Msg
Destination that should receive NAT keep alive messages. If the value
is $PROXY, the messages are sent to the current or outbound proxy.
NAT Keep Alive Dest
Network Settings
DescriptionParameter
Time of service (ToS)/differentiated services (DiffServ) field value in
UDP IP packets carrying a SIP message. Defaults to 0x68.
SIP TOS/DiffServ Value
ToS/DiffServ field value in UDP IP packets carrying RTP data. Defaults
to 0xb8.
RTP ToS/DiffServ Value
SIP Settings
DescriptionParameter
Select from UDP, TCP, or TLS.
Default: UDP
SIP Transport
Port number of the SIP message listening and transmission port.
Default: 5060
SIP Port
Support of 100REL SIP extension for reliable transmission of provisional
responses (18x) and use of PRACK requests. Select Yes to enable.
Default: No
SIP 100REL Enable
The external SIP port number.EXT SIP Port
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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