Operation Manual
Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 244
A
NAT Support Parameters 
G729b Codec Name  G.729b codec name used in SDP.
Defaults to G729ab.
G722 Codec Name  G.722 codec name used in SDP.
Defaults to G722.
NOTE Not supported on the Cisco WIP310.
EncapRTP Codec Name  EncapRTP codec name used in SDP.
Defaults to encaprtp.
Parameter Description
Parameter Description
Handle VIA received  If you select yes, the 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 SPA9000 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.
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