3Com VCX V7122 User Manual page 188

Function
Input Gain Control
Fax and Modem Transport Modes
Real time Fax Relay
Fax Transparency
Modem Transparency
Protocols
VoIP Signaling Protocol
Communication Protocols
Telephony Protocols
In-Band Signaling
Interfaces
Telephony Interface
Network Interface
LED Indicators
LED Indications on Front
Panel
Connectors & Switches
Rear Panel
Trunks
1 to 8 and 9 to 16
Ethernet 1 and 2
AC Power
188
Specification
-32 dB to +31 dB in steps of 1 dB
Group 3 real-time fax relay up to 14400 bps with auto fallback
Tolerant network delay (up to 9 seconds round trip delay)
T.30 (PSTN) and T.38 (IP) compliant (real-time fax)
CNG tone detection & Relay per T.38
Answer tone (CED or AnsAm) detection & Relay per T.38
Automatic fax bypass (pass-through) to G.711, ADPCM or NSE bypass mode
Automatic switching (pass-through) to PCM, ADPCM or NSE bypass mode for modem
signals (V.34 or V.90 modem detection)
SIP - RFC 3261
RTP/RTCP packetization.
IP stack (UDP, TCP, RTP).
Remote Software load (TFTP & BootP support).
PRI (EuroISDN, NI2, 4/5ESS, DMS 100, QSIG)
E1/T1 CAS protocols: MFC R2, E&M wink start,
Immediate start, delay start, loop start, ground start,
Feature Group B, D for E1/T1
DTMF (TIA 464A)
MF-R1, MFC R2
User-defined Call Progress Tones
1, 2, 4, 8 or 16 E1/T1/J1 Balanced 120/100 ohm
Two 10/100 Base-TX, half or full duplex with auto-negotiation
Power, ACT/Fail, T1/E1 status, LAN status, Swap ready indication
Two 50-pin female Telco connectors (DDK57AE-40500-21D) or 8 RJ-48c connectors
for trunks 1 to 8 only
Two 10/100 Base-TX, RJ-45 shielded connectors
Standard IEC320 Appliance inlet.
Option for a dual (fully redundant) power supply.
3Com VCX V7122 SIP VoIP Gateway User Manual