We have a GSM modem and an in house e-mail to SMS system that allows us to
send SMS messages to any mobile in the format <mobile no>@sms.server. Would
that be suitable for the SMS Push feature of the GMS Server or does the SMS
push message have to be a special format that the mobile provider uses as I
believe the SMS message is 'invisible' at the receiving end i.e. doesn't
appear as a normal SMS message.