Cisco SPA-112

The Cisco SPA112 is one of Cisco’s most widely deployed ATAs. It has two FXS ports and a single 100BaseT WAN network interface (no router).

  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Additional Settings
  6. Line 2
  7. Fax Machine


Firmware

Update to the latest firmware for the Cisco SPA112 before connecting to our service. You can download the current production release from the link above. 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.




  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Additional Settings
  6. Line 2
  7. Fax Machine


NAT 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" menu:


NAT Keep Alive Enable: Yes




  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Line 2
  6. Fax Machine


SIP Settings

Under the "SIP Settings" section, make the following change:


SIP Port: 5080help




  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Additional Settings
  6. Line 2
  7. Fax Machine


SIP Registration

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


Proxy: sip.t38fax.com:5080help
User ID: SIP Usernamehelp
Password: SIP Passwordhelp




  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Additional Settings
  6. Line 2
  7. Fax Machine


Additional Settings

In the "Supplementary Service Subscription" and "Audio Configuration" sections, enter the following options:


Call Waiting Serv: No
Three Way Call Serv: No
Preferred Codec: G.711u (USA) or G.711a (rest of the world)
Use pref. codec only: Yes
Silence Supp Enable: No
Echo Canc Enable: No
FAX Passthru method: REINVITE
FAX Enable T38: Yes
FAX T38 ECM Enable: Yes
Fax Tone Detect Mode: Callee only




  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Additional Settings
  6. Line 2
  7. Fax Machine


Line 2

If you do not plan to use Line 2 of your ATA, skip this section entirely and proceed to the next step (Fax Machine) to configure attached fax machine(s).


It is possible to use the SPA112’s second line with T38Fax, in either of the following two ways:


1. Second Fax Machine with the same SIP credentials, and a second fax number. (one single Power-T.38 account)

This scenario is the most popular, and enables your SPA112 to service two separate fax machines, with two separate fax numbers independently. 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.


error IMPORTANT: To use this scenario, we need to make a small change to the Power-T.38 Account you'd like to use. Please call our support line or open a ticket with us requesting this change to have this option enabled. Additionally, you should follow the steps earlier in this article and apply those same changes to Line 2.


First, return to the "Voice -> Line 1" section, and locate the "SIP Settings" section. Make the following changes:


Restrict Source IP: Yes


Now scroll to the "Proxy & Registration" section, and make the following changes:


Make Call Without Reg: Yes
Ans Call Without Reg: Yes





Next, navigate to the "Voice -> Line 2" section, and locate the "SIP Settings" section. Make the following changes:


SIP Port: 5080 (Yes, this must match the SIP Port for Line 1)
Restrict Source IP: Yes


Now scroll to the "Proxy & Registration" section, and make the following changes:

Make Call Without Reg: Yes
Ans Call Without Reg: Yes
Register: No




Finally, scroll down to the "Subscriber Information" section, and make the following changes:

User ID: DID-Alias (Your SIP Username was used here for Line 1, this should be the second fax number assigned to that account)
Password: SIP Password (This should be the same password you configured for Line 1)
Auth ID: SIP Username (This is the SIP Username you configured for Line 1)
Use AuthID: Yes
SIP URI: sip:DID-Alias@127.0.0.1:5080 error (IMPORTANT: Make sure to replace DID-Alias with the fax number you used above)


See the screenshot below for a better understanding, in our example 18043027006 is our SIP Username, and 18043027009 is an additional DID on that account.




2. Second fax machine with different SIP credentials (two separate Power-T.38 accounts)


This scenario is most often used when the two fax machines must receive faxes independently from one another, for instance if one fax machine is for your sales team, the other one for accounting, and the two must never mix. In this case you would have two separate username/password combinations, and you would configure line 2 exactly as you configured line 1, with the following changes:


Next, navigate to the "Voice -> Line 2" section, and locate the "SIP Settings" section. Make the following changes:


SIP Port: 5081




  1. Firmware
  2. NAT Settings
  3. SIP Settings
  4. SIP Registration
  5. Additional Settings
  6. Line 2
  7. Fax Machine


Configure your Fax Machine

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



Why 5080? Learn More

Enter your SIP Username here. (This should be a DID assigned to your account that is available for registration. IE: 18043027000)
Still Confused? Learn More!

Enter the SIP Password for the SIP Username you entered above.
Still Confused? Learn More!