16*FXS analog voice gateway
IAD2000-16S is a multi-function voice gateway used to provide seamless connection from analog phones, fax or analog program-controlled switches PBX to IP voice gateways. It provides 16 FXS voice interfaces, with good voice/fax processing capabilities and high stability, providing efficient and high-quality IP voice services for operators, enterprises, residential users and companies.
Detailed parameters

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IPv6, IPv4
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SIP/IMS
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SIP v2.0 (RFC3261) based on UDP/TCP/TLS
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Fax over T.38 and Pass-through
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QoS:L3 DIFFServ, 802, 1P/Q VLAN Tagging
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3-way conference
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Hunting group
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Voice Mail
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Pluse Dialing
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MWI
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5 km long haul
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Music on hold
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Call waiting
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Call Transfer (Blind transfer, Attend transfer)
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Speed Dial
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Do Not Disturb(DND)
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Automatic firmware upgrade and configuration via HTTP/HTTPS
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System logs & CDR
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Flexible routing & dial plan
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Backup and restore
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SNMP/TR-069
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TLS/SRTP