ethersp.tsp is a EtherSP
belonging to Nortel Networks i2050 Software Phone Telephony Service Provider
from Nortel Networks Corp
Non-system processes like ethersp.tsp originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.