Hai, Thanks for all who give me some feedback regarding VOIP, any futher information would be a appriciate :) I have 2 question here: 1) Is u are using VOIP for two site which both router are connected to the PBX and when we do a test we got noise on the line. As per advice we must check the traffic level is equal or less than the CIR. And we were inform that for each voice chanel is equal to 12kb, Assume that the CIR is 64K thus the allow channel is 5. Thus that meen at one time only 5 call can be made or connected?. 2) My second question is not related to cisco but more to general info. Do any one knew what EM base, AHD, AMO and SDO is. It may be a software/hardware but we have not yet hear of it or it may be in a different name. thanks Nuurul Basar CCNA, MCP __________________________________________________ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]