1 FXS analog telephone ports (RJ11)?? 1 PSTN line FXO port?? dual 10/100 Mbps ports with integrated NAT router</br>Advanced telephony features include caller ID?? call waiting</br>3-way voice conference?? transfer?? forward?? do not disturb?? message indicator?? multi-language voice prompts?? T.38 fax?? flexible dial plan and more</br>Supports up to 2 SIP accounts</br>Status LED for power?? telephone and network ports?? and message waiting indication</br></br>Product Description</br></br>The HT503 is an analog telephone adapter featuring 1 analog telephone FXS port and 1 PSTN line FXO port. The integration of a FXO and FXS port enables remote call origination and termination to and from the PSTN line?? known as "p-off" calling. The 1 FXS port allows for extension of a VoIP service to 1 analog phone. In addition to being SIP compliant?? the product features support for up to 2 SIP account profiles?? excellent voice quality and advanced telephony features</br><br/>http://www.amazon.com/gp/product/B002H29TGAArtaining. Th