NOTE: This blog post is an extension of my blog post on Blocking those Pesky Spam Callers in Microsoft Teams & Skype for Business

There are multiple ways to “block” callers on an AudioCodes SBC, but they primarily depend on if your organization is using Destination Tag Routing to IP Group Sets or a more traditional & static IP to IP Routing configuration. This guide will cover both!

AudioCodes SBCs – Basic Number Blocking

For a basic and quick way to block a number, we are going to create a Inbound Manipulation Rule on our SBC. To configure this:

  1. Login to your AudioCodes SBC and navigate to Setup > Signaling & Media > SBC > Manipulation > Inbound Manipulations and then click New
  2. Fill out the form to look like the one below where the Source IP Group is your SIP Provider

NOTE: The Source Username Pattern field uses AudioCodes’s special way of “RegEx”. An example to block multiple DIDs would be +1330555[1001,1005-1009]# instead of a single in the above image of +13305551001

AudioCodes SBCs – Advanced Number Blocking

For organizations that have much larger lists of numbers to block, you might want to consider utilizing your existing SBC Dial Plan If you already are using a dial plan for routing. I will have a blog on configuring SBC routing using this method in the future! To configure this:

  1. Login to your AudioCodes SBC and navigate to Setup > Signaling & Media > SBC > IP-to-IP Routing and then click New
  2. Fill out the form to look like the one below where the Source IP Group is your SIP Provider. Note that the source Tag is BLOCK, Destination Type is Internal, and the Internal Action is Reply(Response=’607′)
  3. Navigate to Setup > Signaling & Media > SIP Definitions > Dial Plan, click your dial plan name, select Dial Plan Rule x Items, and then click New
  4. Fill out the form to look like the one below. Like the basic method, The Prefix field uses AudioCodes’s special way of “RegEx”. An example to block multiple DIDs would be +1330555[1001,1005-1009]# instead of a single in the above image of +13305551001