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Call Quality issues on internal calls only

dsm600rr

IS-IT--Management
Joined
Nov 17, 2015
Messages
1,445
Location
US
Hello all,

So we have a client running IPO Server Edition on a Virtual Machine in the 11:11 Cloud.

They have multiple locations that call each-other internally and its is fine aside from one random user.

He reports: "When I call or they call from any internal line after a few seconds It sounds like I’m in a can then a loud buzzing almost dial tone sound Comes in and neither person can hear the other then call drops”.

He reports this only happens when calling 2 of the remote locations in particular, out of the 5. The real strange thing is, one of the "trouble" locations is connected direct via fiber to his.

We have tried swapping the switch port he is using, tried swapping phones (J169), deleted and re-created his extension and confirmed with their IT: SIP ALG is disabled, firewall rules allow bi-directional RTP streams, and confirmed VPN isn't doing any packet inspection/firewall rules interfering. We have messed with Direct media path and who knows what else over the last 6 months. It seems to come and go.

My thought was to run a PCAP off a mirrored switch port to see if anything pops out while duplicating the issue, however their switch cant do that per IT. Correct me if I am wrong however I don't believe I can PCAP off the PC Port off the back of the J169, correct?

Suggestions? Thanks!
 
I don't believe I can PCAP off the PC Port off the back of the J169, correct?
Correct!!

We have a few little port mirroring devices, much easier than messing around with a customer's switch (and trusting their IT to get the mirroring right lol). An old laptop running Mint Linux & Wireshark with a 5TB USB drive for logging lets us leave it in a rack (or elsewhere) for extended captures. Sticking one of these behind a phone is very handy and quick (and can just be run off a normal laptop).
 

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