Cisco Systems Linksys PAP2, RT31P2

ADAPTER. Also, set the Substitute_VIA_Addr and NAT_Mapping_Enable parameters. Follow the

instructions of the NAT software to configure static NAT mappings between the external address and

ports (EXT_SIP_Port, EXT_RTP_Port_Min) and the internal address and ports (SIP_Port,

RTP_Port_Min). Set the RTP_Port_Max parameter to a smaller number (for example, RTP_Port_Min

plus 8). There must be mappings for the every port number between RTP_Port_Min and

RTP_Port_Max when using the Manual Configuration approach. Reserving 8 ports is safe, since it

allows both lines to have two simultaneous calls with a port for RTP and RTCP.

Parameter Name Description Type Default

Handle_VIA_received If set to “yes”, the PHONE ADAPTER will process

the “received” parameter in the VIA header inserted

by the server in a response to any one of its

request. Else the parameter is ignored.

Bool No

Handle_VIA_rport If set to “yes”, the PHONE ADAPTER will process

the “rport” parameter in the VIA header inserted by

the server in a response to any one of its request.

Else the parameter is ignored.

Bool No

Insert VIA received Insert received parameter in VIA header in SIP

responses if received from IP and VIA sent-by IP

differ

Bool No

Insert VIA rport Insert rport parameter in VIA header in SIP

responses if received-from port and VIA sent-by

port differ

Bool No

Substitute VIA addr Use nat-mapped IP:port values in VIA header Bool No

Send Resp To Src Port Send response to the request source port instead

of the VIA sent-by port Bool No

STUN Server STUN server to contact for NAT mapping discovery FQDN

STUN Enable Enable the use of STUN to discover NAT mapping Bool No

STUN Test Enable If enabled with <STUN Enable> = “yes” and a valid

<STUN Server>, the PHONE ADAPTER will

perform a NAT type discovery operation when first

power on by contacting the configured STUN

server. The result of the discovery will be reported

in a Warning header in all subsequent REGISTER

requests –

“Warning: 399 Phone Adapter <stun type>”, where

<stun type> is one of the following:

"Unknown NAT Type",

"STUN Server Not Reachable",

"STUN Server Not Responding",

"Open Internet Detected",

"Symmetric Firewall Detected",

"Full Cone NAT Detected",

"Restricted Cone NAT Detected",

"Symmetric NAT Detected";

If the PHONE ADAPTER detects Symmetric Nat or

Symmetric Firewall, Nat Mapping will be disabled

(that is, no substitution of IP address and port with

external IP address an nat-mapped port)

Bool No

Ext IP External IP address to substitute for the actual IP

address of the unit in all outgoing SIP messages. If

“0.0.0.0” is specified, no IP address substitution is

performed.

IP 0.0.0.0