Cisco SPA502 Administration Guide - Page 124

Configuring SIP, SPCP, and NAT Configuring the IP Phone Communications Protocol 4 Parameter Use Auth ID Auth ID Mini Certificate SRTP Private Key Reversed Authentication Realm Description Enables the authentication ID and password for SIP authentication. To enable this feature, select yes. Otherwise, select no. Defaults to no. Authentication ID for SIP authentication. Defaults to blank. Base64 encoding of a mini-certificate concatenated with the 1024-bit public key of the certificate authority (CA) signing the mini-certificate of all subscribers in the group. Defaults to blank. Base64 encoding of the 512-bit private key per subscriber for establishment of a secure call. Defaults to blank. The IP address for an authentication realm other than the proxy IP address. The default value is blank; the proxy IP address is used as the authentication realm. The parameter for extension 1 appears as follows in the phone configuration file: Configuring the IP Phone Communications Protocol By default, the phone automatically detects the protocol and the Unified Communications device. Cisco SPA500 Series IP Phones can be used as part of a Cisco Unified Communications System that uses Smart Phone Control Protocol (SPCP), also known as Skinny Call Control Protocol (SCCP), to manage a voice network. Or the phones can be configured to use Session Initiation Protocol (SIP), an IETF-defined signaling protocol that controls voice communication sessions in an IP network. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 123