The Cisco SPA122 (full name: Cisco SPA122 2-Port ATA with Router) is a 2-port Analog Telephone Adapter (ATA) used to connect analog telephones, fax machines, or PBX (private branch exchange) systems to an IP/VoIP network.

It is designed for small businesses, home offices (SOHO), and individual users.

🛠 Key Technical Specifications

FXS Ports: 2 x RJ-11 ports (for connecting 2 independent analog telephone lines or fax machines).

Ethernet Ports: 2 x RJ-45 10/100 Mbps ports:

WAN: For connecting to an Internet Service Provider (ISP) or a router.

LAN: For connecting a computer or other network equipment (includes built-in router functionality).

Protocol: Supports SIP v2 (Session Initiation Protocol) (RFC 3261).

Voice Codecs: G.711 (a-law / µ-law), G.726, G.729A, G.723.1.

Fax Support: T.38 Fax over IP (FoIP) or G.711 Pass-Through mode.

Network Features: IPv4, IPv6, DHCP Server/Client, NAT, PPPoE, QoS (Quality of Service). 💡 Key Features and Advantages

Two Independent Lines: Allows for the simultaneous management of two separate SIP numbers/accounts.

High Voice Quality: Includes a QoS (Quality of Service) function to prioritize voice packets, preventing interruptions during conversations.

Built-in Router: Equipped with WAN and LAN ports, enabling the sharing of an internet connection with a computer without the need for an additional router.

Security: Supports HTTPS for secure management, as well as SRTP and TLS for voice encryption.

Preservation of Existing Equipment: Allows for the integration of current analog telephones and fax machines into an IP telephony system without requiring their replacement.