We're running 6 computers, 6 SNOM320 VoIP handsets over a Plusnet FTTC connection. We have a BT Business Hub 5, w/ the SIP ALG disabled.
Random parts of the network keep on losing service at random times.
That also happens to the 1 SNOM handset connected directly to the router, for testing purposes.
What could be wrong? The VoIP service is provided by www.voipfone.co.uk.
Next year will be better - than the year after that.