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In case we need to handle speech but we are currently on a SDCCH we need to assign a new channel and close the old one. This implementation should have the correct flow of things but we might need to fix some error situations properly. It is implemented by keeping a secondary_lchan pointer that will be swapped into the lchan pointer after the assignment complete message from the MS. The old lchan will be deactivated (the SACCH should stay open). We have to manually remove the subscr from the lchan structure to properly close things down.