Cisco ATA191-MPP - Cisco ATA 191 Multiplatform

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Cisco ATA191-MPP

The Cisco ATA191-MPP is the next generation of the EOLed SPA112 ATA, one of Cisco’s most widely deployed ATAs. It has two FXS ports and a 100BaseT WAN network interface (no router).

Related Links:


WARNING: ATA19x-MPP (Multiplatform) products are not the same as ATA19x (non-MPP) products. The ATA19x product line is designed to work with Cisco call control systems and not third party telecom products such as T38Fax SIP trunks. Only ATAs with the MPP/Multiplatform designation are certified to work with T38Fax.

SECURITY NOTICE: We do not recommend exposing the web interface of this unit to the Internet, but if you must, remember to change the password on the cisco (user) account as well as the admin account.


1. Firmware

Update to the latest firmware for the Cisco ATA before connecting to our service. You can download the current production release from the link above. If you find the link yourself, ensure you're downloading the "Multiplatfom" version of the ATA firmware. Once downloaded, you'll navigate to "Administration - Firmware Upgrade" and click the "Browse" button. Select the file you downloaded from Cisco's website, and then click "Upgrade" once this has completed your device will reboot. You can then move on to the steps below.


2. Network Settings

Click "Voice" in the primary navigation bar, and then select either Line 1 or Line 2 depending on your circumstances. In our example we use Line 1.

Configure the following options under the "NAT Settings," "Network Settings" and "SIP Settings" menus:

Configuration Option Required Value
NAT Keep Alive Enable : Yes
Network Jitter Level : very high
Jitter Buffer Adjustment : No
SIP Port : 5080
Restrict Source IP : Yes


3. SIP Registration

Under "Proxy & Registration" and "Subscriber Information" configure the following options:

Configuration Option Required Value
Proxy :
Register Expires : 300
User ID : Trunk ID from The T38Fax Portal
Password : Trunk Password from The T38Fax Portal 


4. Feature Settings

In the "Supplementary Service Subscription" section, enter the following options:

Configuration Option Required Value
Call Waiting Serv : No
Three Way Call Serv : No


5. Fax Settings

In the "Audio Configuration" section, enter the following options:

Configuration Option Required Value
Echo Canc Enable : No
FAX Passthru Method : ReINVITE
FAX Enable T38 : Yes
FAX T38 Redundancy : 3
Fax Tone Detect Mode : Callee Only


6. The Second Line

It is possible to use the ATA’s second line to service two separate fax machines, with two separate fax numbers, over one T38Fax trunk. Incoming faxes are delivered to each respective fax machine directly, and on the outbound side each machine appears to be its own separate entity complete with an independent Caller-ID.

If you do not plan to use the second port on your ATA, skip this section entirely and proceed to the next step (Fax Machine) to configure attached fax machine(s).

Navigate to the "Voice - Line 2" section, and configure it as you would Line 1. Next, locate the "Proxy and Registration" and "Subscriber Information" sections. Make the following changes:

Configuration Option Required Value
Register : No
Make Call Without Reg : Yes
Ans Call Without Reg : Yes
Password : SIP Password (Same as Line 1)
Auth ID : SIP Username (Trunk ID/Line 1 Username)
User ID : Secondary DID on trunk
Use AuthID : Yes

See the screenshot below for a better understanding. In our example, 16467511475 is our Trunk ID and 12013562252 is an additional DID on that account.


7. Configuring the Fax Machine

Finally, configure your fax machine to work properly with your Power-T.38 SIP Trunk. Review the following guide for details: Recommended Fax Machine Settings

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