Hello guys!
I´ve been struggling with VoiP in all customers where we have a Sophos UTM installed. They are all using the same VoiP Provider that is hosted on cloud.
The problem is that some of our calls are cutting out. It lasts for a single second and can happen many times in a single call but it is terribly annoying for ours customers because it is enough to miss a word or two. This cutting only happens to anyone behind the UTM (the other side of the line doesn´t).
It´s not a problem with ISP and environment. We have already checked everything because we have an active monitoring server for every device or service.
BUT, I found something that I am almost certain it is the reason of that. Take a look at those ports. They are all RTP which is used for audio streaming.
It´s coming from the Cloud IPBX to our external interface.
Something tells me that it´s something related to stateful connection. As if it wasnt working as intended.
I´ve done some digging and I already changed UDP Timeout according to this article (https://community.sophos.com/kb/en-us/127785) but it didn’t work.
There are no blocks in IPS or stuff. Please help. This is driving me nuts. [:'(]
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