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> Oct 01 16:17:14.92: [26705]: <-- [22:ATX3DT0,001512xxxxxxx\r] ^^ It looks like you are dialling the number blind. If the PABX is particularly overloaded, it might not be ready to accept the number in time. If you really need the comma, your PABX must be very old. In any case, it looks like a modem, or modem configuration problem.