Occasional One way audio on outgoing SIP calls

[kend]

We're having an intermittent issue with some outgoing calls where we can't hear the people outside our office, but they can hear us fine. When it happens it usually lasts for 30sec or less then the call resumes as usual.

We've been working with our SIP provider and they aren't seeing any issues, and of course, our internal Network group isn't seeing any issues either.

I found some Tug logs on the MBG that show some loss during the period of audio trouble.

2018-10-25 16:49:09.252 [DLG 149630][Ch0] SS: u1001

2018-10-25 16:49:09.258 [DLG 149489][Ch0] SS: u1001

2018-10-25 16:49:11.245 [DLG 149489][Ch0] SS: TxRTCP(s=238,l=104,e=0/0,t=1xx.4x.100.3:12241) Jtr=0ms CulmLoss=2050 IntervalLoss=87.9%

2018-10-25 16:49:11.246 [DLG 149667][Ch0] SS: TxRTCP(s=248,l=104,e=0/0,t=1xx.4x.100.3:17615) Jtr=0ms CulmLoss=2050 IntervalLoss=87.9%

2018-10-25 16:49:11.248 [DLG 149630][Ch0] SS: TxRTCP(s=304,l=104,e=0/0,t=1xx.4x.100.3:19297) Jtr=0ms CulmLoss=2050 IntervalLoss=87.9%

Any idea of which side I should be getting the teams to look at? Internal Network or External to the SIP Provider?

[VinceWhirlwind]

Use your MBG to take a packet capture of a call where the problem is experienced.
Then open up the packet capture in Wireshark, click on Telephony and Voip Calls, highlight the call (multiple lines, perhaps) and click Flow Sequence.

[kend]

Thanks. The network group found an asymmetric route on the WAN side that they're investigating now.