You could say that I’ve spent a few hours with Cloud PBX, but it wasn’t until I attended Doug Lawty’s session “Understand the mysteries of Dial Plans and Voice Routes in Skype for Business” at Microsoft Ignite 2016. That a single slide on the default dial plans caught my eye (around the 15 minute mark).
Testing the default extensions rule’s regex, I like to use http://regexstorm.net/tester for quick checks. We can see when the plus is entered it’s carried into the replacement (translation) string, but the plus is not added if missing in the original input.
On a side note, Custom Dial Plan and short code dialing (extension dialing) support is on the roadmap for Cloud PBX. Can’t wait until we have access to create our own rules or when Ken Lasko’s https://www.lyncoptimizer.com/ can generate these for us!