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After downloading the software package from the Ribbon Support Portal, use a checksum calculator (freely available from many third-party vendors) to ensure that the number of bits transmitted is same as the number of bits in your downloaded file. The example used here is available from Sigma Informatics, but Sonus

To calculate the checksum, perform the following steps:

1. Locate and download a free checksum calculator.

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   0 Figure 1 Checksum Calculator 3 #checksum
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2. Scroll down to the bottom of the screen shown in Figure 1 and select the appropriate version for your local computer. Click the file to download.

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   0 Figure 1 File Download
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3. Unbundle/extract the downloaded files.

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   0 Figure 1 Unbundle
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4. Locate the extracted files. Launch the hash_calc_x application.

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   0 Figure 1 Launch Application
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5. Browse and select the sbc<version>.iso archive file (this is the large file from Downloading the SBC SWe Lite Package for On-Premises Deployment).

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   0 Figure 1 Selecting ISO
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6. Click md5. Click Calculate. After several seconds, a Checksum value will appear. 

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   0 Figure 1 Calculate md5
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7. Locate the file you downloaded from the Ribbon Support Portal with the MD5 File type. Open this file with a text editor, and copy only the hex characters from the beginning of the line. 

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   0 Figure 1 Opening in Text Editor
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8. Paste into the Original Checksum field, and then click Compare.
   
   
9. The following message must appear: "Checksums are identical!" If this step reports an error, stop here and do the following:
   1. Repeat the steps to download the files as shown on the Ribbon SBC Edge Support Portal - Download Center page. 
   2. Repeat the steps to verify the checksum

    

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   0 Figure 1 Checksum Identical

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