tree dab9bb0f918903666d908dde1bc1d53561b23a04
parent 91b9a45be42202738d3435425f97887d320f88a7
author Holger Hans Peter Freyther <zecke@selfish.org> 1302955578 +0200
committer Holger Hans Peter Freyther <zecke@selfish.org> 1303211207 +0200

ussd: Keep track of used TIs for USSD and forward messages

Keep track of the used transaction identifier and always forward
messages to the USSD provider. E.g. this can be used to have a
dialogue going. Right now it is still possible that the MSC will
close down the connection.