#1: 8/16 SIM slot, 8/16 antennas
#2: Built-in antennas combiner (Optional)
#3: GSM: 850/900/1800/1900Mhz
#4: WCDMA: 900/2100Mhz or 850/1900Mhz
#5: LTE: Multiple frequency choices for different countries
#6: SIP v2.0, RFC3261
#7: Codecs: G.711A/U , G.723.1, G.729AB
#8: Echo Cancellation
#9: DTMF: RFC2833, SIP Info
#10: Programmable Gain Control
#11: Mobile to VoIP, VoIP to Mobile
#12: SIP Trunk and Trunk Group
#13: Port and Port Group
#14: Caller/Called Number Manipulation
#15: SIP Codes Mapping
#16: White/Black List
#17: PSTN/VoIP Hotline
#18: Abnormal Call Monitor
#19: Call Minutes Limitation
#20: Balance Check
#21: Random Call Interval
#22: Auto CLIP
#23: Signaling & RTP Encryption
#24: SMPP for SMS
#25: HTTP API for SMS
#26: Polarity Reversal
#27: PIN Management
#28: SMS/USSD
#29: SMS to Email, Email to SMS
#30: Call Waiting/Call Back
#31: Call Forward
#32: GSM Audio Coding: HR, FR,EFR, AMR_FR,AMR_HR
#33: HTTPS/HTTP Web Configuration
#34: Configure Backup/Restore
#35: Firmware Upgrade by HTTP/TFTP
#36: CDR(10000 Lines Storage Locally)
#37: Syslog/Filelog
#38: Traffic statistics: TCP,UDP,RTP
#39: VoIP Call Statistics
#40: PSTN Call statistics: ASR,ACD,PDD
#41: IVR Customization
#42: Auto Provisioning
#43: SIP/RTP/PCM Capture
#44: Work with Dinstar SIMCloud/SIMBank (Optional)