Hi, Codec = PCMU Wireshark RTP analyse: Jitter in the Wireshark max=2,9 ms; mean=0,57 But the last RECV_RTCP_MESSAGE event show this: ========================================== SSRC: 0eb0e841 NTP-Most-Significant-Word: 3724642770 NTP-Least-Significant-Word: 4165677056 RTP-Timestamp: 14487886 Sender-Packet-Count: 1409 Octect-Packet-Count: 225440 Last-RTP-Timestamp: 14487924 RTP-Rate: 8000 Capture-Time: 1515653966925374 Source0-SSRC: 7c1b0ae5 Source0-Fraction: 0 Source0-Lost: 0 Source0-Loss-Avg: 0 Source0-Highest-Sequence-Number-Received: 32561 Source0-Jitter: 159 Source0-LSR: 2311973851 Source0-DLSR: 63014 And the last RTCP event from the Wireshark show this: ============================================= Real-time Transport Control Protocol (Sender Report) 10.. .... = Version: RFC 1889 Version (2) ..0. .... = Padding: False ...0 0001 = Reception report count: 1 Packet type: Sender Report (200) Length: 12 (52 bytes) Sender SSRC: 0x0eb0e841 (246474817) Timestamp, MSW: 3511979744 (0xd1548ee0) Timestamp, LSW: 2709503779 (0xa17fbf23) [MSW and LSW as NTP timestamp: Apr 16, 2011 21:55:44.630855000 UTC] RTP timestamp: 3435008682 Sender's packet count: 3257276450 Sender's octet count: 4258211364 Source 1 Identifier: 0x463e7aa2 (1178499746) SSRC contents Fraction lost: 248 / 256 Cumulative number of packets lost: 1105247 Extended highest sequence number received: 1972857173 Interarrival jitter: 1013423106 Last SR timestamp: 1007735790 (0x3c10d3ee) Delay since last SR timestamp: 108449976 (1654815 milliseconds) [RTCP frame length check: OK - 52 bytes] 1. What is the formula to get the jitter in ms from the rtcp? I can’t find anything in the web, or I can’t recognise the answer. 2. What is wrong, the RECV_RTCP_MESSAGE event or the RTCP from the receiver? If I have the answer to the first question, i can answer the second question by my self ;-) Thanks a lot!!! By the way, it is the newest FreeSwitch from yesterday.