Cisco SRP521W-K9-G1 Administration Guide - Page 129
Send Resp To Src Port, Insert VIA rport
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Configuring Voice Configuring Voice Settings 6 Handle VIA rport If you select yes, the SRP processes the rport parameter in the VIA header (this value 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. 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. The default is no. Insert VIA rport Inserts the 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. Substitute VIA Addr 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. 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 dropdown menu. The default is no. STUN Enable Enables the use of STUN to discover NAT mapping. Select yes or no from the drop-down menu. The default is no. STUN Test Enable If the STUN Enable feature is enabled and a valid STUN server is available, the SRP can perform a NAT-type discovery operation when it powers on. It contacts the configured STUN server, and the result of the discovery is reported in a Warning header in all subsequent REGISTER requests. If the SRP detects symmetric NAT or a symmetric firewall, NAT mapping is disabled. The default is no. Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models) 129