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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
OL-4008-01
Chapter1 Cisco Analog Telepho ne Adaptor Overview
Software Features
Software Features
The Cisco ATA supports the following protocols, services and methods:
•Voice Codecs Supported, page 1-7
•Additional Supported Signaling Protocols, page 1-7
•Other Supported Protocols, page 1-7
•Cisco ATA H.323 Services, page 1-8
•Fax Services, page 1-9
•Supplementary Services, page 1-9

Voice Codecs Supported

The Cisco ATA supports the following voice codecs (check your other network devices for the codecs
they support):
•G.711µ-law
•G.711A-law
•G.723.1
•G.729
•G.729A
•G.729B
•G.729AB

Additional Supported Signaling Protocols

In addition to H.323, the Cisco ATA supports the following signaling protocols:
•Session Initiation Protocol (SIP)
•Skinny Client Control Protocol (SCCP)
•Media Gateway Control Protocol (MGCP)
H.323 and SIP share the same software image. SCCP and MGCP als o share a software image, which is
separate from the H.323/SIP image. If you wish to perform a cross-protocol upgrade from H.323 to
another signaling image, see the “Upgrading the Signaling Image from a TFTP Server” section on
page 8-1.

Other Supported Protocols

Other protocols that the Cisco ATA supports include the following:
•802.1Q VLAN tagging
•Cisco Discovery Protocol (CDP)
•Domain Name System (DNS)
•Dynamic Host Configuration Protocol (DHCP)