I have a very peculiar problem at one of our customer sites. There is a DN 6001 configured on CM5. It is connected to a fax machine through an ATA. When it is tested externally from a PSTN line, there is no problem. However, if we try to call the same number using a mobile phone network, it gives an error, this number does not exist as if it is not connected at all. I have checked using debug voice dial peer and found that the call is coming to the voice gateway.