I find Axon to be very good
I am using
1 PSTN line - mainly for incoming calls (out going far cheaper on VOIP!) - on a Sipura 3102 - also where I live (Alderney, Channel Islands) number porting is not allowed - so needed to keep main company number
6 VOIP external lines - various companies - depending on which gives best call rates -
I use voipfone as my main outgoing lines, but also have sipgate (best for UK mobiles), aql, entacall, freshtel, and also Skype uplink
Extentions
Internal -
3 using Grandstream 2000
3 using Grandstream BudgeTone 200
1 using ATL 250
2 using Express Talk softphone
1 using Sipura 3102 (shared with the PSTN line)
External
also have colleagues working out of the office
all using Grandstream BudeTone 200
1 in Alderney, 1 in London, 1 in Australia
also using IVM answering attendant which answers the calls when there is no reply (my staff get 15 seconds to answer BEFORE the answing attendant) and then get the option to keep holding (press 1), leave a message (press 0), or transfer to a mobile (press 7) which works very well.
Regards
Paul
Island Computers
Alderney
Channel Islands
PS I have tried various FXO adapter cards and gateways and find the Sipura the only one I can get to work properly