Using this transfer protocol is not recommended in this case. This type of message SHOULD be delivered synchronously. In case it is delivered asynchronously, t

Using this transfer protocol is not recommended in this case. This type of message SHOULD be delivered synchronously. In case it is delivered asynchronously, the receiving peer MAY refuse it. Another possible problem is that, since 6 months is a long time, you might get time-out before the message is ever delivered.