hi, this timer intends to deallocate the resource allocated if the MS is not able to use it.
keeping the resource (= 1 TCH) for 8s means it cannot be allocated to anyone else in the meanwhile.
therefore, the main effect will be congestion increase.
But of course, it will increase the chances that the MS finally gets through and manages to get its TCH.
Be wary that 16 might mean “8s3, it all depends on how it is hardcoded in your system.
From previour post, it looks like T10 is only used for intracell HO and call setup, but this has to be verified.