I put a voice mailbox at
voip.ms (on SP2) on my PSTN line by setting:
Physical Interfaces -> Line Port -> Calling Features ->
CallForwardOnNoAnswerEnabled : checked
CallForwardOnNoAnswerNumber : sp2(0118835100xxxxxxxx)
CallForwardOnNoAnswerRingCount : 5
Where "0118835100xxxxxxxx" is a free iNum DID provided by
voip.ms. In the menu at
voip.ms DID Numbers -> CallerID Filtering I have a rule for inbound from 0118835100xxxxxxxx to immediately go to the voice mailbox (also on failover conditions Busy, No Answer, and Unreachable). The originating callerid number is lost in the forward to
voip.ms (which actually makes this Rube Goldberg work) so I have "say callerid" turned off in the
voip.ms mailbox configuration. MWIEnable and X_VMWIEnable are checked on SP2. I turned the answering machine off on the base unit of the cordless system connected to the phone port. I have speed dial #2 set to **2*97 to retrieve voice mail from
voip.ms. There is no charge from
voip.ms for this forwarding because it's
voip.ms DID to DID dialing (the iNum is effectively calling itself.. think about that for a second and it may still not make sense to you, a drink might help). I get the stutter VM waiting sound but I guess my cordless doesn't support the visual indicator. I probably couldn't
see the indicator anyway. Since I configure my OBi locally (No, I'm not brainwashed nor a cult member although perhaps newbeeish at times and slowbeeish at others) I have speed dial #1 set to my google voice number because dialing 1# and 2# seems intuitive to me to retrieve VM from SP1 and SP2 respectively. The ObiTalk portal would force speed dial #1 to a soft phone that I don't ever use (unless I'm experimenting).
This method of madness probably (maybe?) could be adapted for use with voip providers other than
voip.ms.
It's not exactly what you wanted or needed, but with the OBi, what is?!?