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B-4
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Appendix B Cisco ATA Specifications
Software Specifications
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 for SCCP
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
Table B-6 Software Specifications (All Protocols) (continued)
Description Specification