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For the MSC we need to queue GSM04.08 messages until the SCCP connection is confirmed to be open and then can send the stored messages. The queue is limited to 10 messages at which point new ones will be dropped. Currently the only messages we get are measurement indication messages but it is better to be safe than sorry. The SCCP messages are sent as soon as the connection is considered established and then no queueing happens any more. While replacing sccp_connection_write calls various memory leaks has been fixed. For the MS we might have received a DTAP and need to do an operation that requires a roundtrip and want to send wait until this has happened. The two scenerios are sending a SMS to the phone that requires to do something special for the different SAPI. Currently it is assumed that only one SAPI=0 -> SAPI=3 change happen during the connection. For the first SAPI != 0 we will send the rll_ request and then wait for the timeout or confirmation. In case of timeout a SAPI "n" reject is sent and in case of success the queue is getting emptied.