My small business has a completely separate wired VOIP phone network. All 12 phones are connected to a cisco switch, and then to a Balance 20. The Balance 20 is connected to a 50Mbps Comcast high speed router/modem with the router placed in bridged mode.
We frequently get dropped calls, or phones down. My VOIP provider, Voisip, says that nothing is wrong with the internet at the times of the dropped calls. All RTP and SIP port forwarding in the modem is done correctly, and the router is in SIP compatibility mode (It won’t work otherwise).
VOISIP says there may be additional router specific rules that are required. Does anyone know if additional rules are required in the Balance 20 for reliable VOIP operation?