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...002] | <----> MPLS connection 4 Mbps --> [Asterisk cluster 003] Calls between Cluster 001 <---> cluster 002 or 003 are potentially of bad quality (sometimes ok but most of all jiterish) Calls between Cluster 002 <---> cluster 003 are good The bandwidth if cluster001 ( 20 Mbps) is used about 50% with peaks to 75%. I've aslo actived the jitter buffer with a buffer of 200ms but this didn't seem to do any good. Does anybody have some hints how I can troubleshoot this? Note: the Cisco calls to the other affiliaters over the same WAN don't have issues...