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Cisco ATA 187 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)
OL-21862-01
Appendix A ATA 187 Specifications
SIP Compliance Reference Information
SIP Compliance Reference Information
Information on how the ATA 187 complies with the IETF definition of SIP as described in RFC 2543 is
found at the following URL:
http://www.ietf.org/rfc/rfc2543.txt
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 RFC 2833 AVT tones for SIP
Note Cannot transmit RFC 2833 and in-band signalling,
simultaneously.
Configuration • DHCP (RFC 2131)
• Web configuration via built-in Web server
• Touch-tone phone 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
Note Does not support CoS service.
Security RC4 encryption for TFTP configuration files
Voice coder-decoders (codecs) • G.729, G.729A, G.729AB
• 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 SIP (RFC 3261 bis)
Table A-6 Software Specifications (All Protocols) (continued)
Description Specification