Hi, While terminating calls to Cisco 5300 the called party hears converstion all OK. However, calling party hears periodic short bursts of interferance and/or lost packets noise. I can see on CLI this: Mar 5 14:35:53 DEBUG[458773]: rtp.c:943 ast_rtp_raw_write: Difference is 3760, ms is 490 Mar 5 14:35:53 DEBUG[458773]: rtp.c:943 ast_rtp_raw_write: Difference is 3200, ms is 420 Mar 5 14:35:55 DEBUG[458773]: rtp.c:943 ast_rtp_raw_write: Difference is 704, ms is 108 Mar 5 14:35:55 DEBUG[458773]: rtp.c:943 ast_rtp_raw_write: Difference is 952, ms is 139 And so on... I have come across above message before but I just can not remember what it is for... Any pointers would be greatly appreciated. Ta SJ