Mark, I saw something similar to this on a customer's pilot of AVVID. The symptoms were such that if a call between IP phones was established prior to the traffic flood, everything worked just fine. If the traffic flood came first, the destination IP phone rang, but no voice packets were received by either phone, period. And, this was in a pure LAN environment! Looking at the display on the 7960s, we discovered that not one UDP packet was arriving at either phone! (The fact that the destination phone rang would seem to indicate that TCP traffic was arriving OK). Unfortunately there was no sniffer available to capture the traffic to dissect the problem. The fix was to change the parameters on the traffic generator. The customer was using Network Observer. It was a new tool for them. The traffic being generated was designated as "raw" ethernet frames. As soon as the traffic type was changed to "TCP" or any other selection, the problem disappeared. What are you using to saturate the WAN link? What I saw might trigger some observation in your network. Bruce
Mark S wrote: >Well, this should give you enough to chew on since voice is becoming a hot >topic. I am trying to configure VoIP with QoS. Why over IP and not over >ATM, you say? I have to controll the call with a H.323 Gatekeeper, and that >is IP. > >My problem appears to be that the call setup (or maybe signalling?) appears >to be delayed. The test results are as follows: > >If the WAN link is saturated with data packets PRIOR to establishing the >voice call, the first 10 to 15 (approximately) seconds of the call are >lost. After the call is established, voice is rock solid and no voice >packets are delayed or lost. > >If the voice call is established PRIOR to saturating the WAN link with data >packets, the voice call is rock solid and no voice packets are delayed or >lost. > >Thoughts or configs would be appreciated. > >--Mark > > >version 12.2 >service timestamps debug datetime msec >service timestamps log datetime msec >no service password-encryption >! >hostname Router >! >logging buffered 4096 debugging >! >memory-size iomem 25 >ip subnet-zero >! >no ip domain lookup >! >ip cef >! >voice call carrier capacity active >voice rtp send-recv >! >no voice hpi capture buffer >no voice hpi capture destination >! >vc-class atm vip > vbr-rt 256 256 10 > precedence 5 > no bump traffic > no protect vc > no protect group >! >vc-class atm normal > vbr-nrt 192 192 > precedence other > no protect vc > no protect group >! >interface ATM0/0 > ip address 1.1.1.254 255.255.255.0 > ip nat outside > no atm ilmi-keepalive > bundle-enable > bundle qosmap > protocol ip 1.1.1.1 > encapsulation aal5snap > pvc-bundle data 0/37 > class-vc normal > pvc-bundle voice 0/36 > class-vc vip > ! > dsl equipment-type CPE > dsl operating-mode GSHDSL symmetric annex A > dsl linerate AUTO > h323-gateway voip interface > h323-gateway voip id Gatekeeper ipaddr x.x.x.x 1718 > h323-gateway voip h323-id Gateway > ip rsvp bandwidth 64 64 > ip rsvp resource-provider wfq pvc >! >interface FastEthernet0/0 > ip address 10.200.100.1 255.255.255.0 > ip nat inside > speed auto >! >ip nat inside source list 1 interface ATM0/0 overload >ip classless >ip route 0.0.0.0 0.0.0.0 1.1.1.1 >no ip http server >ip pim bidir-enable >! >access-list 1 permit 10.200.100.0 0.0.0.255 >! >call rsvp-sync >! >voice-port 2/0 > station-id name StaID > station-id number 1112223333 > caller-id enable >! >voice-port 2/1 > station-id name StaID > station-id number 1112223333 > caller-id enable >! >dial-peer cor custom >! >dial-peer voice 1 voip > destination-pattern T > session target ras >! >gateway >! >line con 0 >line aux 0 >line vty 0 4 > login >! >no scheduler allocate >end -- Bruce Enders Email: [EMAIL PROTECTED] Chesapeake NetCraftsmen o:(410)-280-6927, c:(443)-994-0678 1290 Bay Dale Drive, Suite 312 WWW: http://www.netcraftsmen.net Arnold, MD 21012-2325 Cisco CCSI# 96047 Efax 443-331-0651 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=57184&t=57104 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
