We've hit a with a voip issue and I'm hoping someone might be able to point me in the right direction.
Brief history: Went from Coredial to Skyswitch about a year ago. It's been a rocky road. Lots of issues with any client over like 5 phones. After working with Sonicwall finally determine that we've been grossly undersizing our firewalls ( we use them exclusively ). Went through and upgraded all problematic clients and the issue seemed to be resolved.
We found out along the way that SS sends registration like every 5 seconds, as opposed to our other provider that sends them a more normal 3600.
Fast forward to today. One client is having continual issues. It is only on inbound calls. They describe it as a fading in and out, "like someone is leaving you a message" is what they say.
I've listened to hours of calls and I don't hear it. What I do hear is the incoming calls sounds like they're clipping. LIke the audio is way too hot, but not every call.
We've ruled out the firewall. It's properly sized and has all the correct rules for SS.
I've talked to verizon twice now, they have Fios with a static block. They came out once and said everything is fine, talked to them again recently and they see no issues and will be happy to come back out for a fee.
Internally phones are vlan'd.
VOIP provider has looked and has said yes we see pdv and jitter.
We use the same firewall rule set for all our clients so we've ruled that out. ( Same as least as VOIP is concerned) So that's where we are.
From the pcaps you see that outgoing look fine. But incoming RTP streams are full of loss and jitter. Also you see that they have CN playload when outgoing does not.
If you look at any of these calls ,I've been using "prepare filter" I see no issues with the RTP packets.
Looking for a little direction here. I'm still working with the provider on this but figured someone may have an idea.
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