Cisco SPA525G Administration Guide - Page 216

SPA and Wireless IP Phone Field Reference SIP Tab B NAT Support Parameters Parameter Handle VIA received Handle VIA rport Insert VIA received Insert VIA rport Substitute VIA Addr Send Resp To Src Port STUN Enable Description 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. 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. 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. 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. Lets you use NAT-mapped IP:port values in the VIA header. Select yes or no from the drop-down menu. Defaults to no. Sends responses to the request source port instead of the VIA sent-by port. Select yes or no from the dropdown menu. Defaults to no. Enables the use of STUN to discover NAT mapping. Select yes or no from the drop-down menu. Defaults to no. Cisco SPA and Wireless IP Phone Administration Guide 214