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Introducing Cisco Small Business Analog Telephone Adapters
ATA Soft ware Features
ATA Administration Guide 25
1
NOTE
• With the SPA8000, use line 1 or line 2 to access the IVR functions. See the
SPA8000 Quick Installation Guide for IVR instructions.
• For proper operation, the service provider should use an Outbound Proxy to
forward all voice traffic when the SPA8000 is located behind a router. If
necessary, explicit port ranges can be specified for SIP and RTP.
• The SPA8000 is not designed to forward IP packets to devices connected to its
AUX port and that configuration is not supported.
• The SPA8000 also can be configured with trunk groups and trunk lines. See
“SIP Trunking and Hunt Groups on the SPA8000,” on page 77.
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 25
• “SIP Proxy Redundancy,” on page 27
• “Other ATA Software Features,” on page 27
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