I am using asterisk 1.4.18 (server A ) and have it store records in mysql database . One of my client uses predictive dialer ( asterisk 1.2.26 based and server B ) which makes many calls . B registers with A over sip and there is no nat involved If i re-invite rtp from server B to my carrier ( server A in between ) I saw many calls having duration of 0,1 or 2 seconds on server A's cdr but surprisingly all these calls were marked at 15 minutes usage on my provider's records . My sip route provider himself is re-inviting traffic ahead to their media gateways . I have gone through asterisk sip.conf and i don't see any setting limiting anything to around 15 minutes , default rtp timeout settings are around 60 seconds in asterisk . My provider says that they don't have any 15 minute limit on their end . The records on server B also suggests that calls are indeed very small 1 to- 3 seconds . Server A and B both have static ip's and there is no bandwith problem on server A . If i disable re invites on server A then this problem isn't present . Did anybody else have this kind of problem ? Any suggestions