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I have installed this for Us/Canada and it works well, I put in 1112223333 and it formats (111) 222-333. If I input 1112223333 444 It will format (111) 222-3333 x444. It I input 1112223333 4444 it gives an error, if I change the extension to 3 digits (444) it will save the node. I did not see any issue int he queue regarding this.