I am having some issues with some phones and was hoping someone could hopefully point me in the right direction. I am not a phone guy by any means, so excuse any mistakes or anything that is unclear. Our past set up was as follows
Site A - Sonicwall NSA 250 M with Avaya IP Office 8.1
Site B - Sonicwall TZ 205 with 20x Avaya 9608 phones
The sites are connected via a Site to Site VPN.
A week or so ago, we swapped out Firewalls. We moved Site A's to Site B, and put a Sonicwall NSA 2600 at Site B. We did a simple export/import of configs. Even though they were different Firewall models, Sonicwall documentation said it was supported, and we haven't had any issues. Except one.
Our phones seem to experience call dropping and quality issues. We get 10x dropped calls a day, and inside IP Office I can see Quality of Service Alarms going off like crazy.
I have set up QoS and BWM on both sides of the Firewalls, I don't believe bandwidth is the issue. It's ONLY my remote phones at Site B, which are all H.323 phones. But if someone from Site A calls Site B, there is a chance it will drop as well. Site A can call Site A all day, or externally, no issues. I played around with H323 transformations on the Sonicwall, and that actually seemed to fix the issue, but after enabling it my phones would deregister themselves after a few hours, and would not re-register.
I have set up wireshark on both ends, nothing out of the ordinary, no increase of traffic when issues comes up.
Our codec was set to 8kb previously, I changed it to a 64kb codex, and no change. I would think I would see 1/8th packet loss atleast, but I still get anywhere from 30-80%.
I've attached a picture of my QoS alarms. My phone system is .40.
I have gone over both Sonicwalls, switches, anything related over and over and I can't find out what the issue is. The rest of the network is fine. I can send data over that VPN just fine 24/7, no latency or packet loss.
Any help would be appreciated.