I have spa400 (18.104.22.168) linked with spa9000 (6.1.5a). 99% of calls routed thru the PSTN via any of the FXO ports on spa400 are misdialed. A friendly voice from BT saying "This service is not available..." ? Having checked an re-checked dialplans and call routing rule I do not believe this is where the fault lies since occasionally a call will get through!
If I try to change any of the parameters on the "Voice" tab of the spa400 web interface the changes are not accepted and return to original value when page is refreshed (i.e. tried changing "DTMF Power" from default -130 to, say, -80 but after "save all changes" and a reboot of spa400 the value had reverted to -130)
Have tried reset to factory default several times but failed to resolve this issue ???
any help to resolve this much appreciated.