C-4
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
OL-4008-01
AppendixC Cisco ATA Specifications
Software Specifications
Fax G.711 fax pass-through and G.711 fax mode.
Enhanced fax pass-through is supported on the Cisco ATA.
Success of fax transmissions up to 14.4 kbps depends on
network conditions, and fax modem/fax machine tolerance to
those conditions. The network must have reasonably low
network jitter, network delay, and packet-loss rate.
Line-echo cancellation •Echo canceller for each port
•8 ms echo length
•Nonlinear echo suppression (ERL > 28 dB for frequency
= 300 to 2400 Hz)
•Convergence time = 250 ms
•ERLE = 10 to 20 dB
•Double-talk detection
Out-of-band DTMF •H.245 out-of-band DTMF for H.323
•RFC 2833 AVT tones for SIP, MGCP, SCCP
Configuration •DHCP (RFC 2131)
•Web configuration via built-in Web server
•Touch-tone telephone keypad configuration with voice
prompt
•Basic boot configuration (RFC 1350 TFTP Profiling)
•Dial plan configuration
•Cisco Discovery Protocol
Quality of Service •Class-of-service (CoS) bit-tagging (802.1P)
•Type-of-service (ToS) bit-tagging
Security •H.235 for H.323
•RC4 encryption for TFTP configuration files
Voice coder-decoders (codecs)
Note In simultaneous dual-port operation, the second port is
limited to G.711 when using G.729.
•G.723.1
•G.729, G.729A, G.729AB
•G.723.1
•G.711A-law
•G.711µ-law
TableC-6 Software Specifications (All Protocols) (continued)
Description Specification