Cisco ATA 191 2-Port Analog Telephone Adapter
The Cisco ATA 191 connects two analog phones, fax machines or paging devices to a SIP VoIP network through a single Ethernet port. Backed by a 12-month warranty from Reboot IT. Supplied as the adapter unit only — the power adapter is not included.
Key Benefits
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Two FXS analog ports: run two independent analog devices, each registered as its own SIP line.
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Keeps legacy devices working: analog handsets, fax machines and overhead paging carry on after a move to VoIP.
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Fax over IP: T.38 fax relay plus G.711 fax pass-through for dependable fax transmission.
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Cisco call control: compatible with Cisco Unified Communications Manager (CUCM) and Communications Manager Express (CME).
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Standard codecs: G.711 a-law and μ-law, G.729a and G.729ab.
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Small footprint: a compact desktop adapter with one 10/100 Mbps RJ-45 Ethernet port.
Performance in Use
Most offices moving to IP telephony still have devices that only speak analog: a fax machine in accounts, a door phone at reception, an overhead paging amplifier in the warehouse or a cordless phone that staff rely on. The ATA 191 gives each of those a SIP identity on your phone system, so they keep working without rewiring or replacing the device.
Each of the two FXS ports is configured independently, so one adapter can serve a phone and a fax line side by side. For fax, T.38 relay handles transmission over the IP network, with G.711 pass-through available where your provider or call control prefers it.
The ATA 191 is designed for Cisco call control environments, registering with Cisco Unified Communications Manager or Communications Manager Express. It connects to the network with a single RJ-45 Ethernet cable.
Technical Specifications
| Brand |
Cisco |
| Model |
ATA 191 Analog Telephone Adapter |
| Analog ports |
2 x FXS (RJ-11) |
| Network port |
1 x 10/100 Mbps Ethernet (RJ-45) |
| Signalling protocol |
SIP (UDP and TCP) |
| Voice codecs |
G.711 a-law, G.711 μ-law, G.729a, G.729ab |
| Fax |
T.38 fax relay, G.711 fax pass-through |
| Call control |
Cisco Unified Communications Manager, Communications Manager Express |
| Power |
Requires 5V DC 2.4A adapter (not included) |
| Included |
ATA 191 unit only |
| Warranty |
12 months from Reboot IT |
Is It Right for You?
| ✓ Best For |
✗ Not For |
Connecting analog phones and fax machines to a Cisco VoIP system Offices keeping door phones or paging on SIP Businesses running Cisco CUCM or CME |
Buyers who need a power adapter in the box Systems that require SCCP (the ATA 191 is SIP only) More than two analog devices per adapter |
Condition Grades
| Grade A — Excellent |
Minimal signs of previous use. Light marks may be visible on close inspection. |
| Grade B — Good |
Visible light wear such as scuffs or scratches on the housing. Fully functional. |
Frequently Asked Questions
Does it come with a power adapter?
No. This listing is for the ATA 191 unit only. It requires a Cisco 5V DC 2.4A power adapter, which is not included.
How many phones can I connect?
Two. The ATA 191 has two FXS ports, and each can be configured as a separate SIP line.
Can I use it with a fax machine?
Yes. It supports T.38 fax relay and G.711 fax pass-through.
Which phone systems does it work with?
The ATA 191 is designed for Cisco call control, including Cisco Unified Communications Manager and Communications Manager Express, using SIP.
Does it support SCCP?
No. The ATA 191 uses SIP only.
What warranty is included?
A 12-month warranty from Reboot IT covering hardware faults.
How much is shipping?
Orders ship with free standard AU shipping.
Warranty and Support
Every Cisco ATA 191 sold by Reboot IT comes with a 12-month warranty from Reboot IT covering hardware faults. Reboot IT has supplied business IT equipment from Melbourne since 2001, with an Australian-based support team if you need help. Orders ship with free standard AU shipping. Find out more at reboot-it.com.au.