Features:

Users: 100 
Concurrent Calls: 25 
Voicemail: 3000min
​Up to 16 Analog Ports (FXO/FXS)

Up to 8 GSM Ports(Quad-Band GSM/GPRS850/900/1800/1900MHz)

​LAN: 1 (10/100Mbps) 
WAN: 1 (10/100Mbps)​

Features:

Users: 32
Concurrent Calls(Max): 15
Voicemail: 3000min

LAN: 1 (10/100Mbps)
Size: 193x153x30 mm
Weight: 500g
Power Supply: AC 100~240V/50~60Hz (DC 12V, 1A)

Features:

Users: 300 
Concurrent Calls: 50 
Voicemail: Default 3000min

One E1/T1/J1 ports (Support PRI,MFC R2,SS7), 2 FXS Ports
One RS232 Port

​LAN: 1 (10/100Mbps) 
WAN: 1 (10/100Mbps)

Power Supply: AC 100-240V  50/60Hz 0.5A MAX

Features:

Users: 200 
Concurrent Calls: 50 
Voicemail: Default 3000min (upgradable)
 Auto-Recording(Add-on): Support 

Up to 16 Analog Ports (FXO/FXS)

​LAN: 1 (10/100Mbps) 
WAN: 1 (10/100Mbps)

Power Supply: AC 100-240V  50/60Hz 1.5A MAX


IP TELEPHONY

Features:

Users: 100 
Concurrent Calls: 25
Voicemail: Default 3000min (upgradable) 
Auto-Recording(Add-on): Support 

Up to 16 Analog Ports (FXO/FXS)

LAN: 1 (10/100Mbps) 
WAN: 1 (10/100Mbps)
USB: 1 (USB2.0)
Audio In/Out: Supported

Features:

Users: 500 
Concurrent Calls: 80 
Voicemail: Default 3000min (upgradable) 
Auto-Recording: Support
Hard Disk: Support 2.5 inch SATA2 (Optional)

Up to 16 Analog Ports (FXO/FXS)

One RS232 Port
LAN: 1 (10/100/1000Mbps) 
WAN: 1 (10/100/1000Mbps)
USB: 1 (USB2.0)

​Power Supply: AC 100-240V  50/60Hz 1.5A MAX