Group, Hoping that someone can help me out with a VoIP QoS issue that I am currently dealing with. I work for a service provider, and I am currently troubleshooting a VoIP over frame relay quality complaint. My end user has a 768K host with four 256K drops dedicated solely to VoIP traffic. My customer states that he experiences intermittent jitter on his calls, but they follow no real pattern. We have had his vendor place test calls, and sometimes 7 simultaneous calls can go through fine while 3 simultaneous calls will experience poor call quality and excessive jitter. The end user's vendor is of no real help with this issue stating that his configurations are fine and the trouble must be with the WAN link. I have verified that the entire network is clean, no T1 performance monitor errors , no input errors on the customer's serial interfaces, and no input errors to my frame switch. No apparent utilization issues, the host averaged 50% port utilization during a 24 hour sniff. We have also verified the drops are not receiving any FECNs or BECNs. I have a copy of the customer's router configurations and his map-class statements appear to be correct as well. His CIR and MINCIR are set to match the frame relay PVC CIR in my network (which I believe means that he has configured the statements to prevent any bursting, please correct me if I am wrong). On to my question. The only discrepancy I find with this customer's configuration is his queuing. On all four of his drop routers he has configured WFQ, on his host he has no queuing specified. Could this be the cause of all of his problems? Would WFQ be the most desirable method? What I have read in the past led me to believe that a fragment statement in the map-class was the most desirable because it activated the dual-FIFO feature on the physical interface. I do not have a great deal of experience with VoIP so all I have to go on right now are theories. Any direction is greatly appreciated.
Thanks, Steve Lamb CCDA, CCNA Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=55597&t=55597 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
