Grandstream HT881 Technical Specifications

Telephony Interface

• HT881: 8 RJ11 FXO ports/1 RJ11 FXS

Network Interface

• Two 10/100/1000Mbps RJ45 ports, one with 802.3af PoE-PD support
• Note: Up to 1000Mbps in Bridge mode, up to 100Mbps in NAT mode

LED Indicators

• POWER, NET1, NET2, FXS, FXO

Factory Reset Button

• Yes

Telephony Features

• Caller ID display or block, call waiting, flash, blind or attended transfer, forward, hold, do not disturb, 3-way conference

Voice Codecs

• G.711 with Annex I (PLC) and Annex II (VAD/CNG), G.723.1, G.729, G.726, iLBC, OPUS, dynamic jitter buffer, advanced line echo cancellation

Fax over IP

• T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax Pass-through

Short/Long Haul Ring Load

• 3 REN: Up to 1km on 24 AWG

Caller ID

• Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID

Disconnect Methods

• Busy Tone, Polarity Reversal/Wink, Loop Current Signaling

Network Protocols

• TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, TELNET, STUN, SIP (RFC3261), SIP over TCP/TLS, SRTP, TR-069

QoS

• Layer 2 (802.1Q VLAN, SIP/RTP 802.1p) and Layer 3 (ToS, Diffserv, MPLS)

DTMF Method

• In-audio, RFC2833 and/or SIP INFO

Provisioning and Control

• HTTP, HTTPS, TFTP, SSH, TR-069, secure and automated provisioning using AES encryption, syslog

Security

• Media SRTP
• Control TLS/SIPS/HTTPS

Management

• Syslog support, Telnet, SSH, Remote management using web browser

Physical

• Universal Power Supply
• POE Input: 4-8V / 0.5A
• DC Input: 12V/1A

Environmental

• Operational: 32°F - 104°F
• Storage: 14°F - 140°F
• Humidity: 10% - 90% Non-condensing

Dimension and Weight

• 190mm x 100mm x 28mm (L x W x D)
• Weight: 0.46KG

Compliance

• FCC/CE/RCM/IC/UKCA