The Grandstream Handytone 502 (HT-502) is SIP 2.0 standard compliant and features 2 FXS ports, dual 10M/100Mbps Ethernet ports with integrated high performance NAT router, port status and message waiting LED, and a base stand for vertical positioning. It supports Universal Plug-in-Play (UPnP), up to 2 SIP account profiles, and traditional and advanced telephony features. The HT-502 provides an enhanced level of security and provides automated provisioning using symmetric and asymmetric voice codec/RTP in any call sessions, and supports a broad range of popular voice codecs. Features & Benefits Universal Plug-in-Play (UPnP) 2 FXS ports (RJ11) w/up to 2 SIP account profiles Dual10/100 Mpbs ports (RJ45) w/integrated router Advanced features: -caller ID, call waiting, 3-way conference, blind or attended transfer -call forward, do not disturb, voicemail, MLS voice prompts -T.38 fax, flexible dial plan, direct IP calling Supports Voice Codecs: -G.711(a/u-law), G.723.1, G.729A/B, G.729E -G.726-40/32/24/16 and iLBC T.38 Fax HTTP/HTTPS/Telnet/TFTP Provisioning SIP over TCP/TLS IP connectivity for any phone and fax Web management for easy configuration and installation Offers traditional and advanced telephony features Portable and compact for use at home or on the road