Based on this product's specifications, here are some alternatives and similar models
AudioCodes MediaPack 504 Analog VoIP Gateway, 2 FXS Ports, Software Upgradable to 4 FXS
Summary description:
The AudioCodes MediaPack 504 is a high-performance analog VoIP gateway designed for reliable voice communication. It features 2 FXS voice interfaces for connecting analog telephones or fax machines to IP networks. The device supports a software-based upgrade path to expand capacity to 4 FXS ports, providing flexibility for growing business needs. It ensures high voice quality and seamless integration with SIP-based telephony systems for professional environments.