````markdown # How to Configure a Cisco 7940 Phone ### Step 1 Go to `\\\\10.10.10.10` ### Step 2 Access the folder **TFTP-Root** Here you can find the **SIP Flash Image** for your phone. If the version is not the correct…

How to Configure a Cisco 7940 Phone

Last updated: April 2026
Reading time: ~2 min
Audience: Boxis customers and administrators.

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What you'll accomplish

• Complete the configuration or task described in this guide for your Boxis service.

Prerequisites

• Access to the interface, device, or server described below.
• Information or credentials you received from Boxis (contract, welcome e-mail, or client area).

Note Boxis: Offers and screens may differ slightly depending on your product. When in doubt, open a support ticket with your service reference.

# How to Configure a Cisco 7940 Phone

### Step 1  
Go to `\\10.10.10.10`

### Step 2  
Access the folder **TFTP-Root**  

Here you can find the **SIP Flash Image** for your phone.  
If the version is not the correct one, go to the **Cisco website**, look for the phone model you want to update, and download the corresponding **SIP Flash Image**.  
Then save the files in the **TFTP-Root** folder.

### Step 3  
Once you have the right SIP Flash Image, make sure that the first line in `SIPDefault.cnf` corresponds to the correct image version that you have:  
```ini
image_version: "P0S3-07-5-00"

Step 4

Access the folder Config

Step 5

Here you can set the phone with the client information.

Step 6

Make a copy of the following three files:

CTLSEPmac.tlv
SEPmac.cnf
SIPmac.cnf

Step 7

Replace "mac" in each file’s name with the MAC address of the phone you want to update. Example:

SIPmac.cnf → SIP0009433cd627.cnf
CTLSEPmac.tlv → CTLSEP0009433cd627.tlv
SEPmac.cnf → SEP0009433cd627.cnf

Step 8

Open the file SIPmac.cnf with Notepad++, and modify the following two lines:

line1_authname: ""
line1_password: ""

You can find the authname and password in the client's info (services >> corresponding line).

Step 9

Now you can plug in the phone and wait for it to update automatically.

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✅ Your phone is now configured!

Expected result

• The product behaves as described in each step (connectivity, message, or UI state).

If something goes wrong

• Repeat the step and check for typos (hostnames, passwords, ports).
• Note the exact error message or screenshot.
• Open a ticket in the Boxis client area with the service name, time of the test, and any trace (e.g. traceroute) if it is a network issue.

See also

• Other articles in the same category in the Boxis knowledge base.
• /knowledgebase/ — main knowledge base index.