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I've checked on phone systems configured with 3-digit and 4-digit extensions and on both systems the length of the SIP trunk extensions is 5. But what if you configure your PBX with 5 digit extensions? Does the PBX use 6-digit extensions for trunks? If it stays at 5 digits, you would have conflicts with user extensions. Is it always 5 digits or are they sometimes more or less than 5 digits?