Cisco Systems 188 Manual De Usuario

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)

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