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Chapter 5
SPA900 Series Phone Field Reference
EncapRTP Codec Name
NAT Support Parameters
Field
Handle VIA received
Handle VIA rport
Insert VIA received
Insert VIA rport
Substitute VIA Addr
Send Resp To Src Port
STUN Enable
Document Version 3.0
EncapRTP codec name for the encapsulating RTP payload type to be used in the
rtpmap attribute in the SDP. Both sides must use the same name to interoperate
properly.
The default is EncapRTP.
Description
If you select yes, the 900 Series phone processes the received parameter in the
VIA header (this is inserted by the server in a response to anyone of its requests).
If you select no, the parameter is ignored. Select yes or no from the drop-down
menu.
The default is no.
If you select yes, the 900 Series phone processes the rport parameter in the VIA
header (this is inserted by the server in a response to anyone of its requests). If
you select no, the parameter is ignored. Select yes or no from the drop-down
menu.
The default is no.
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.
The default is no.
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.
The default is no.
Lets you use NAT-mapped IP:port values in the VIA header. Select yes or no from
the drop-down menu.
The default is no.
Sends responses to the request source port instead of the VIA sent-by port. Select
yes or no from the drop-down menu.
The default is no.
Enables the use of STUN to discover NAT mapping. Select yes or no from the
drop-down menu.
The default is no.
Linksys 900 Series IP Phone Administrator Guide
SIP Tab
5-17
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