The Skyetel Spam Calls Prevention service is a mechanism that blocks robocalls and solicitors from hitting your PBX by re-routing them to a pre-recorded message.
How Spam Prevention Works
One of the signature features of a spam caller is they place tens of thousands of calls per day to numbers that are geographically distributed throughout the country. Additionally, they tend to have very low average call length because people quickly realize it is a spam call and then hangup the call. This, and a few other top secret techniques, allows the Spam Prevention service to track telephone numbers that are frequently used for spam calls. In turn, that data gets turned into a database that Skyetel can query on every inbound call.
It is important to note that Skyetel does not own this database - we only contribute to it (we also have to pay to access this data). This is actually one of the best features of this Database - many many carriers contribute to this database every day (Publicly traded carriers such as Comcast, Frontier, AT&T etc also contribute to and pay for this database). Because so many carriers contribute to this database, the results are extremely accurate and can effectively identify about 90% of spam calls.
Calling your own phone numbers from our network may trigger the spam filter. For example, if 13609865200 calls 13609865200, we will assume that that call is fraudulent and it could be filtered.
Enable Spam Prevention
To enable Spam Prevention, simply navigate to the phone numbers menu in the Skyetel Portal:
Select the number you would like to enable Spam Prevention on, and Configure "Spam Call Filter" from the Features menu:
Spam Risk Threshold
The Spam Risk Threshold is a numerical value that represents the likelihood that the party calling your phone number is spam. There is a lot of black magic that goes into generating this number, but the end result is the following:
0 – 39 = Low risk
40 – 79 = Medium risk
80 – 100 = High risk
You can adjust this metric to your preference in order to adequately adjust the volume of spam calls you recieve. By default, we use 80.
What The Spam Filter Options Mean
Block Spam Calls
This is our default option. In this configuration, calls are sent to a recording telling them their calls have been rejected. You will see these calls in your CDRs on Skyetel, but they will not reach your endpoint.
Pass through spam calls with SIP header
For our customers who want to maintain their own database for Spam Calls (and allow for custom whitelists) you can use this option. When enabled, we will route your calls to your endpoint whether or not they are spam. However, you will see a new SIP Header:
You will only have the following results:
If the result is 0, then the Risk Score did not exceed your specified threshold. If the result is 1, then the Risk Score did exceed your threshold.
In addition to the Spam Score, you will also receive the Spam Risk Score:
You may use this to configure your own custom routing.
Do Not Cache This
Do not cache the Spam Risk Score - The Risk Score and the Spam Score change frequently (Often daily) and caching these results will cause you to maintain an outdated database and inadvertently block regular callers.
Pass through spam calls with CID Prefix
With this option enabled, we will prepend "SPAM: " to the Caller ID of this call. This will allow you to answer spam calls, but warn your users before they answer. For this option to work, you must have our Caller ID settings enabled.