Linksys SPA 900 SERIES manual NAT Support Parameters

Chapter 5 Linksys IP Phone Field Reference

SIP Tab

Field	Description
G729a Codec Name	G.729a codec name used in SDP.
(not applicable to SPA901)	Defaults to G729a.
G729b Codec Name	G.729b codec name used in SDP.
(not applicable to SPA901)	Defaults to G729ab.
G723 Codec Name	G.723 codec name used in SDP.
(not applicable to SPA901)	Defaults to G723.
EncapRTP Codec Name	EncapRTP codec name used in SDP.
(not applicable to SPA901)	Defaults to encaprtp.

NAT Support Parameters

Note None of the following parameters apply to the SPA901.

Field	Description
Handle VIA received	If you select yes, the Linksys IP phone processes the received parameter in the VIA header
	(this is inserted by the server in a response to any of its requests). If you select no, the
	parameter is ignored. Select yes or no from the drop-down menu.
	Defaults to no.
Handle VIA rport	If you select yes, the Linksys IP phone processes the rport parameter in the VIA header
	(this is inserted by the server in a response to any of its requests). If you select no, the
	parameter is ignored. Select yes or no from the drop-down menu.
	Defaults to no.
Insert VIA received	Inserts the received parameter into the VIA header of SIP responses if the received-from
	IP and VIA sent-by IP values differ. Select yes or no from the drop-down menu.
	Defaults to no.
Insert VIA rport	Inserts the rport parameter into the VIA header of SIP responses if the received-from IP
	and VIA sent-by IP values differ. Select yes or no from the drop-down menu.
	Defaults to no.
Substitute VIA Addr	Lets you use NAT-mapped IP:port values in the VIA header. Select yes or no from the
	drop-down menu.
	Defaults to no.
Send Resp To Src Port	Sends responses to the request source port instead of the VIA sent-by port. Select yes or
	no from the drop-down menu.
	Defaults to no.

	Linksys IP Phone Administrator Guide
5-16	Firmware Version 5.1