[Skunkworks] VoIP calls dropping

Hello All I am having an issue with a client who i am doing VoIP. Calls can be ongoing then they suddenly drop.Doing a simple traceroute i am able to reach the client's server and router. Ping tests indicate a round trip of about 20-30ms.I dont think this can affect the quality.What cud be the cause of the call drops? Also is there a tool i can use to measure VoIP perfomance. Also note that i have not done any QoS because the calls are too few Thanks ---------------------------------------------- This message has been scanned for viruses and dangerous content by Jambo MailScanner, and is believed to be clean. --------------------------------------------- "easy access to the world"