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3Com
®
VCX V7111 VoIP Gateway User Guide
Silence Suppression
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).
Packet Loss Concealment
G.711 appendix 1
G.723.1
G.729 a/b
Echo Canceler
G.165 and G.168 2000, 64 msec
Gain Control
Programmable
DTMF Transport (in-band)
Mute, transfer in RTP payload or relay in compliance with RFC 2833
DTMF Detection and
Generation
Dynamic range 0 to -25 dBm, compliant with TIA 464B and Bellcore TR-NWT-
000506.
Call Progress Tone
Detection and Generation
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.
Output Gain Control
-32 dB to +31 dB in steps of 1 dB
Input Gain Control
-32 dB to +31 dB in steps of 1 dB
Fax/Modem Relay
Fax Relay
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)
Modem Transparency
Auto switch to PCM or ADPCM on V.34 or V.90 modem detection
Protocols
VoIP Signaling Protocol
SIP RFC 3261
Communication Protocols
RTP/RTCP packetization.
IP stack (UDP, TCP, RTP).
Remote Software load (TFTP, HTTP and HTTPS).
Line Signaling Protocols
Loop start
Processor
Control Processor
Motorola PowerQUICC 860
Control Processor
Memory
SDRAM – 64 MB
Signal Processors
3Com AC482 VoIP DSP
Interfaces
FXS Telephony Interface
24 Analog FXS phone or fax ports, loop start (RJ-11)
Network Interface
10/100 Base-TX
Summary of Contents for VCX V7111
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