VoIP telephone adapter Cisco ATA191-K9

The Cisco ATA 190 (ATA191-K9) is an analog telephone adaptor that converts traditional handsets and fax machines into IP devices by connecting them to an Ethernet network. It provides two independent RJ-11 voice ports (each with its own telephone number) and a single RJ-45 10/100BASE-T Ethernet port, supporting simultaneous voice calls or fax sessions. The unit supports standard VoIP codecs and protocols and is suitable for integration into enterprise, small-office, and managed-voice service environments.

Advantages

The Cisco ATA 190 preserves existing telephone investments by enabling standard analog phones and fax machines to operate as IP endpoints while using existing Ethernet LAN deployments. It supports simultaneous use of both voice ports and provides cost-effective migration to VoIP. The adapter includes support for common codecs and fax transport methods for reliable voice and fax communication and meets multiple regulatory certifications for deployment in residential and business settings.

Suitable for

• Connecting analog telephones to a SIP-based VoIP network
• Adding a second telephone line or fax line in small offices or homes
• Service providers offering managed VoIP or second-line services
• Integrating legacy fax machines using T.38 fax relay

Key specifications

• Model: Cisco ATA 190 (ATA191-K9)
• Interfaces: 2 × RJ-11 FXS voice ports, 1 × RJ-45 10/100BASE-T Ethernet
• Audio codecs: G.711 (µ-law/A-law), G.729A/B (as supported by ATA191-K9)
• Fax support: T.38 fax relay for reliable faxing over IP
• Protocol: SIP for VoIP signalling
• Certifications: FCC, CE, A-Tick, RoHS, UL (as per product data)

How to use

Connect analog phones or a fax machine to the RJ-11 ports and link the ATA to the local network using the RJ-45 Ethernet port. Configure the device via its web-based interface or provisioning system to register with a SIP server or VoIP service provider, assign telephone numbers to each FXS port, and set preferred audio codecs and fax transport options. Both ports can be used at the same time for voice or fax sessions.

Usage recommendations

For best results, place the ATA on a reliable Ethernet connection and configure QoS on the network to prioritize voice traffic. Use T.38 for fax transmissions when supported by the service provider, and verify codec compatibility (G.711 or G.729 variants) between the ATA and the VoIP system.