XONTEL Plus PBX, Руководство пользователя

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1.5 Features & Functions
1.5.1
Key Features

FXO interface on a single PBX.

Send/receive calls from PSTN/PLMN via FXO.

Flexible dial plan and routing strategies based on time, number and source IP etc.
 IVR Customization.
 Support high-speed NAT forwarding.

Serve as VPN client.

Support voicemail and call recording.

Built-in SIP server, support up to 60 SIP extensions and 15 concurrent calls.
 User-friendly web interface, multiple management ways.
1.5.2
Physical Interfaces

FXO Ports: 2

USB port: 1
 SD Slot: 1

Network Port
：
1 WAN Port & 1 LAN Ports
（
10/100 Base-T RJ45
）
1.5.3
Voice Capabilities

VoIP Protocols: SIP over UDP/TCP/TLS, SDP, RTP/SRTP

Codecs: G.711a/μ law, G.723.1, G.729A/B, G722
 Silence Suppression
 Comfort Noise Generator (CNG)

Voice Activity Detection (VAD)

Echo Cancellation: G.168 with up to 128ms
 Dynamic Jitter Buffer
 Adjustable Gain Control
 Automatic Gain Control
（
AGC
）
 Call Progress Tones: Dial Tone, Ring Back Tone, Busy Tone
 FAX: T.38 and Pass-through

NAT Traversal: STUN/UPnP

DTMF: RFC2833/Signal/Inband