Specifications

C-4
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for SCCP (version 3.0)
OL-4652-01
Appendix C 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
Voice features • Voice activity detection (VAD)
• Comfort noise generation (CNG)
• Dynamic jitter buffer (adaptive)
Voice-over-IP (VoIP) protocols • H.323 v2
• SIP (RFC 2543 bis)
• MGCP 1.0 (RFC 2705)
• MGCP 1.0/network-based call signalling (NCS) 1.0 profile
• MGCP 0.1
• SCCP
Table C-6 Software Specifications (All Protocols) (continued)
Description Specification