Home / Products /

ATA Grandstream HT503

Network integration between PSTN and POTS has never been so easy. The HT503 is a hybrid analog telephone adapter and VoIP router that enables the user to create an easily integrated hybrid solution with backup lifeline support.


The HT503 enables an integrated hybrid deployment between PSTN and VoIP environments. Users can utilize “hop-on and hop-off” calling through its FXO and FXS port that enables remote call origination and termination to and from the PSTN line. This ATA features 1 analog telephone FXS port and 1 PSTN line FXO port. Users can utilize the device for extension of a VoIP service to 1 analog phone with the FXS port. In addition to being SIP compliant, this product features support for up to 2 SIP account profiles, excellent voice quality and advanced telephony features.


  • 1 FXS analog telephone ports (RJ11), 1 PSTN line FXO port, dual 10/100 Mbps ports with integrated NAT router
  • Advanced telephony features include caller ID, call waiting
  • 3-way voice conference, transfer, forward, do not disturb, message indicator, multi-language voice prompts, T.38 fax, flexible dial plan and more
  • Supports up to 2 SIP accounts
  • Status LED for power, telephone and network ports, and message waiting indication

Other

  • Gateway ATA HT802

    Gateway ATA HT802

    Designed for users looking to connect their analog devices to a VoIP network at home or in the office. The HT802 is a powerful analog telephone adapter that is easily deployable and manageable. It comes equipped with 2 FXS ports to create a high-quality network solution.

  • Voip gateway HT812

    Voip gateway HT812

    Designed for users looking to connect their analog devices to a VoIP network at home or in the office. The HT812 is a powerful analog telephone adapter that is easily deployable and manageable. It comes equipped with 2 FXS ports and an integrated Gigabit NAT router.

  • voip gateway HT814

    voip gateway HT814

    The HT814 delivers powerful VoIP technology and routing capabilities to home and office environments, and allows users to successfully connect their analog devices to a manageable, robustnetwork. Built using Grandstream’s market-leading SIP ATA/gateway technology, with millions of units successfully deployed worldwide, this powerful ATA features exceptional voice quality in various applications and environments.

  • ATA Grandstream HT704

    ATA Grandstream HT704

    The HT702/704 analog telephone adapter (ATA) allows users to create a high-quality and manageable IP telephony solution for home or office applications. The product features 2/4 FXS port and 1 10/100Mbps port to extend VoIP services to analog phones.

Hotline: (+84) 919.900.247