Main Number Handling – PSTN number as a Response Group IVR Destination

In my last post, I covered how to have a Response Group Queue overflow/timeout action send a call to a PSTN number. That means you can send a call to an analog phone (maybe a cordless one), a mobile, or any other PSTN number. That’s awesome for overflow and timeouts, but there’s still a hole in Response Group functionality: how can an IVR option deliver a call to a PSTN destination?

Every once in a while, you need to get creative in your solutions to meet end-user requirements. The solution here is tricky to figure out, but simple to configure once you know what to do.

To review, a Response Group IVR is when someone calls a workflow number, hears options, and presses a corresponding key. The native workflow options are to deliver the call to a Queue, or to ask another series of questions. There is no option to deliver a call to a PSTN number.

If we look deeper at the Queue configuration, the only place to specify a PSTN number is in the overflow and timeout options. If we could set the workflow to deliver a call to a Queue, and set the Queue to overflow immediately to a telephone number, we’d be set. We can do that by setting the Maximum number of calls in the Queue configuration to zero:


And if you try the call, it will not work. As it turns out, a Queue will error out if there is no Group assigned to the Queue. The fix is simple: create a user in AD, enable them for SfB and enable Enterprise Voice, create a new Response Group group and assign the new user as an Agent. Assign that Group to the Queue:

Group in Queue

And things will work – a call to the IVR, where the caller selects the option for the mobile number, will be forwarded to that mobile phone immediately. The Queue process throws an error when it see there isn’t a Group with at least one Agent assigned, it never gets far enough in the process to look at the overflow options.

I don’t recommend that you use a real user’s SfB account for this. Create a fake account, and make sure you add comments or notes to indicate the purpose of the account, so that it’s not deleted or changed.

If you’re going to use this solution for a number of different workflows, you can use a more generic name for the User and Group, and use the same User and Group for all the Queues, as the destination is configured in the Queue.



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