Hi, I created an outbound rule with prefix 8, and mask r. If I dial 84100, this number is recognized by the system, the digit 8 is stripped, and 4100 is sent to the Voip pstn device configured for this rule, the call progress and the 4100 is called. But, if I modify the rule, or create another one with prefix 41, and without any transform mask (no r), it is not possible to call 4100. It seems that 3CX have a conflict number with digit 41. I'm using internal numbers 4001 to 4022 for testing . At the other end have numbers with 2xxx, 3xxx and 41xx. Same problem with 3XXX. No problem when making rules for 2xxx numbers. It's a little crazy. Does 3CX have some internal numbers with 3xxx and 4xxx ? Could you help me?