Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 123

Configuring Security, Quality, and Network Features Setting Security Features 5 The IP phones use UDP as a standard for SIP transport, but they also support SIP over TLS for added security. To enable TLS for the phone: STEP 1 Log in to the web administration interface. STEP 2 Click Admin Login and advanced. STEP 3 Click Ext , then scroll to the SIP Settings section. STEP 4 Select TLS from the SIP Transport drop-down box. STEP 5 Click Submit All Changes. SRTP and Securing Calls Secure Real-Time Transport Protocol (SRTP) is a secure protocol for transporting real-time data over networks. Cisco SPA 500 Series and Wireless IP Phones use SRTP to securely send and receive real-time voice traffic from other phones and gateways. Security Description (RFC 4568) is supported. SRTP provides media encryption to ensure that media streams between devices are secure and that only the intended devices receive and read the data. When a call is secure, the voice conversation is encrypted so that others cannot eavesdrop on the conversation. To enable this feature the IP phone must have a mini-certificate installed. The supplementary service Secure All Calls (*16)-Defaults to prefer to use encrypted media (voice codecs). Audio packets in both directions of outbound calls are encrypted using SRTP. To use Secure Call on an extension, you must configure Mini Certificate and SRTP Private Key for that extension. These parameters appear on the Ext tabs. Secure Call Service activates secure encryption of RTP streams between the two endpoints. You can disable this if the other endpoint (or gateway) does not support this proprietary method. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 112