Hi to all,
I have this annoying issue coming after 4 years of no problems and without changes to my environment. We hear on incoming external calls something like a CLOCK randomly (so not everytime) and periodically(so when it happens we hear the CLOCK every some seconds ). The issue is only on our side, so on the side of the caller the sound is perfect. After investigeting that there are no issue on the local phones sides, I made two tcp dumps, the first one on the freepbx console, and you can clearly view the interfacence in the picture below that is coming from the italian provider EHIWEB to the local freepbx
and I made another dump in the router console too(this is a pfsense box with a lot of resources) and I can see again the noise coming directly from their IP to our like this
at this point I was sure that the issue is coming from the providers side, and after sending them everything I have they told me that a second level IT replied in this way:
"From the analysis of the audio streams it is clear that it is a broacast msg on the customer LAN network, since it is present even before the conversation is established, on the carrier side this anomaly is not present in any other customer "
so I checked again and again the cap that I’m attaching( the router’ s side one router_cap.tgz (1,7 MB)
) but I cannot find any broadcast message (I searched on the wireshark wiki for the appropriate filter eth.dst == FF:FF:FF:FF:FF and other tools) without results, so I cannot understand where they found this message if we are looking at the same cap.
Any help or starting point will be very usefull for me… many thanks