Hi! I have a problem with SonicWall TZ205 somehow blocking the ring when making calls from a phone connected to a Grandstream UCM6208 PBX. The calls go through and I can hear and be heard but there is no ring when connecting. I set-up the VoIP trunk account on a couple of other Grandstream devices including on a similar PBX, one device behind a SonicWall 105 the other with just a Comcast router in front, and it works, so my conclusion is that the SonicWall is causing the problem. Grandstream support says that they are expecting a 180 but getting a 183. I tried suggested settings for SIP with no success. any ideas?
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