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Debugging intermittent audio dropout with RTP over OpenVPN
From: Andrew Martin <amartin () xes-inc com>
Date: Thu, 10 Sep 2015 13:31:03 -0500 (CDT)
Hello, I am using an Asterisk server and Yealink SIP phones (e.g SIP-T32G) both on a LAN as well as a few phones connecting over the Internet via an OpenVPN connection (so that NAT is not required). The phones on the LAN work well, however calls involving the phones connecting over the Internet intermittently experience audio quality problems (e.g. calls will drop audio for 15 seconds or audio will be very garbled when someone talks). This is very intermittent; sometimes a call is completely fine. I have performed some pcap captures of calls that are having problems, with the resulting RTP statistics: Call 1: Max delta: 20.77ms Max jitter: 0.24ms Mean jitter: 0.14ms Max skew: 1.37ms Total RTP Packets: 3030 (expected 3030) Lost RTP Packets: 95 (3.14%) Duration: 99.21s (-3792ms clock drift) Call 2: Max delta: 119.14ms Max jitter: 23.56ms Mean jitter: 4.24ms Max skew: -228.31ms Total RTP Packets: 7668 (expected 7668) Lost RTP packets: 37 (0.48%) Duration: 261.06s (-243ms clock drift) Call 3: Max delta: 112.05ms Max jitter: 7.73ms Mean jitter: 3.40ms Max skew: -46.48ms Total RTP Packets: 4055 (expected 4055) Lost RTP packets: 33 (0.81%) Duration: 162.59s (-25460ms clock drift) Looking at statistics from the router (where the OpenVPN server is also running) I cannot see any packet loss or other problems. What else can I try to narrow down the source of these VoIP quality problems? Is there other information I can provide or that I should look for to help identify the problem? Thanks, Andrew Martin ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: https://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe
Current thread:
- Debugging intermittent audio dropout with RTP over OpenVPN Andrew Martin (Sep 10)
- Re: Debugging intermittent audio dropout with RTP over OpenVPN Jeroen Eeuwes (Sep 10)
- Re: Debugging intermittent audio dropout with RTP over OpenVPN Andrew Martin (Sep 10)
- Re: Debugging intermittent audio dropout with RTP over OpenVPN Jeroen Eeuwes (Sep 10)
- Re: Debugging intermittent audio dropout with RTP over OpenVPN Andrew Martin (Sep 10)
- Re: Debugging intermittent audio dropout with RTP over OpenVPN Jeroen Eeuwes (Sep 10)