3Com VCX v7111 User Manual page 392

Silence Suppression
Packet Loss Concealment
Echo Canceler
Gain Control
DTMF Transport (in-band) Mute, transfer in RTP payload or relay in compliance with RFC 2833
DTMF Detection and
Generation
Call Progress Tone
Detection and Generation
Output Gain Control
Input Gain Control
Fax/Modem Relay
Fax Relay
Modem Transparency
Protocols
VoIP Signaling Protocol
Communication Protocols
Line Signaling Protocols Loop start
Processor
Control Processor
Control Processor
Memory
Signal Processors
Interfaces
FXS Telephony Interface
Network Interface
392
G.723.1 Annex A
G.729 Annex B
PCM and ADPCM - Standard Silence Descriptor (SID) with Proprietary Voice
Activity Detection (VAD) and Comfort Noise Generation (CNG).
G.711 appendix 1
G.723.1
G.729 a/b
G.165 and G.168 2000, 64 msec
Programmable
Dynamic range 0 to -25 dBm, compliant with TIA 464B and Bellcore TR-NWT-
000506.
32 tones:
single tone, dual tones or AM tones, programmable frequency & amplitude; 64
frequencies in the range 300 to 1980 Hz, 1 to 4 cadences per tone, up to 4 sets
of ON/OFF periods.
-32 dB to +31 dB in steps of 1 dB
-32 dB to +31 dB in steps of 1 dB
Group 3 fax relay up to 14.4 kbps with auto fallback
T.38 compliant, real time fax relay
Tolerant network delay (up to 9 seconds round trip)
Auto switch to PCM or ADPCM on V.34 or V.90 modem detection
SIP RFC 3261
RTP/RTCP packetization.
IP stack (UDP, TCP, RTP).
Remote Software load (TFTP, HTTP and HTTPS).
Motorola PowerQUICC 860
SDRAM – 64 MB
3Com AC482 VoIP DSP
24 Analog FXS phone or fax ports, loop start (RJ-11)
10/100 Base-TX
®
3Com VCX V7111 VoIP Gateway User Guide