TCASSALL : assignment complete of.. SDCCH or TCH ?
CCALLS : total SDCCH attempts, ncluding SMS attempts ? The name “CCALLS” suggest it is only counting Calls Setup. (Handovers don’t go through SDCCH, afaik)
Can you please post the values of those counters for 1 typical hour here ? So I can see how far out the counters are. I know that Ericsson counters are tricky to understand, because they are a bit obscure and limited (in my experience, few years ago… maybe it’s better now).