Cisco SPA2102-SF Administration Guide - Page 26

Introducing Cisco Small Business Analog Telephone Adapters ATA Software Features 1 By default, the device on the LAN port is assigned the network address 192.168.0.0 with a subnet mask of 255.255.255.0. If there is a network address conflict with a device on the Ethernet port, the network address of the device on the LAN port is automatically changed to 192.168.1.0. NOTE • The IVR functions are accessed by connecting an analog telephone to Phone 1 only. • For proper operation, the service provider should use an Outbound Proxy to forward all voice traffic when the SPA8800 is located behind a router. If necessary, explicit port ranges can be specified for SIP and RTP. ATA Software Features The ATA device is a full featured, fully programmable phone adapter that can be custom provisioned within a wide range of configuration parameters. This section contains a high-level overview of features to provide a basic understanding of the feature breadth and capabilities of the ATA device. The following sections describe the factors that contribute to voice quality: • "Voice Supported Codecs," on page 26 • "SIP Proxy Redundancy," on page 28 • "Other ATA Software Features," on page 28 Voice Supported Codecs Negotiation of the optimal voice codec sometimes depends on the ability of the ATA device to match a codec name with the codec used by the far-end device. The ATA device allows the network administrator to individually name the various codecs that are supported so that the ATA device can successfully negotiate the codec with the far-end equipment. The administrator can select which low-bit-rate codec is to be used for each line. G.711a and G.711u are always enabled. Cisco Small Business ATA Administration Guide 26