Grandstream Networks Grandstream HandyTone HandyTone-488 User Manual

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•  Supports SIP 2.0(RFC 3261), TCP/UDP/IP, RTP/RTCP, HTTP, ICMP, ARP/RARP, 

DNS, DHCP (both client and server), NTP, PPPoE, STUN, TFTP, etc.  

•  Built-in router, NAT, Gateway and DMZ port forwarding 

•  Supports call origination and termination from/to the PSTN network (via FXO port) 

•  Powerful digital signal processing (DSP) to ensure superb audio quality; advanced 

adaptive jitter control and packet loss concealment technology  

•  Support various vocoders including G.711 (a-law and u-law), G.723.1 (5.3K/6.3K), 

G.726 (40K/32K/24K/16K), as well as G.728, G.729A/B, and iLBC.  

•  Support Caller ID/Name display or block, Hold, Call Waiting/Flash, Call Transfer, Call 

Forward, in-band and out-of-band DTMF, Dial Plans, etc. 

•  Support fax pass through 

•  Support Silence Suppression, VAD (Voice Activity Detection), CNG (Comfort Noise 

Generation), Line Echo Cancellation (G.168), and AGC (Automatic Gain Control) 

•  Support standard encryption and authentication (DIGEST using MD5 and MD5-sess)  

•  Support for Layer 2 (802.1Q VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS) 

•  Support automated NAT traversal without manual manipulation of firewall/NAT  

•  Support device configuration via built-in IVR, Web browser or central configuration file 

through TFTP or HTTP 

•  Support firmware upgrade via TFTP or HTTP with encrypted configuration files. 

•  Ultra compact (wallet size) and lightweight design, great companion for travelers 

•  Compact, lightweight Universal Power adapter.