First of all, I just wanted to mention that today I set up 3CX for the first time, and it took me less than an hour to get up and running with my ITSP, Digital Receptionist and a few extensions. I can't believe how easy it was. Great job! I have run into a few problems that I can't seem to find an answer for. The most important of these issues is the extension length. When installing 3CX, it asks how many digits to set for your extensions and mentions that this cannot be changed. I selected 3 digits. We're currently transitioning from 2 to 3 digit extensions. Our current system allows aliases to be entered and we have 2 extensions per user (one with 2 digits and one with 3). The IVR will allow either extension length to be used. I haven't figured out how to do this with 3CX, and I'm not sure if it's possible. I did find the SIP ID field and it appears that this works similarly to an alias. When I dial the SIP ID from an internal extension, it works as expected. However, if I dial the SIP ID after being routed to the digital receptionist (external -> DID -> digital receptionist -> 2 digit SIP ID), it does not work as expected and the digital receptionist voice recording just repeats (it doesn't say that the extension was invalid). Is there anyway to allow both 2 digit and 3 digit extensions from the digital receptionist?