My configuration is SPA9000 + SPA400 + SPA942's, all with latest firmware as of 2/4/2010. Using the SPA400 for voicemail on line 1, line 2 is registered to my ITSP, Nexvortex.
Everything is working fine, except......
Sometimes (not always) when I put an inbound caller on hold (actually, either park or hold), when I resume the call, we lose the audio connection to the inbound caller. I have seen the audio die in one or both directions. Of course when this happens the remote caller gets frustrated and hangs up. Note that the call is still connected, one or both parties just cannot hear each other. Prior to placing the call on hold the audio is fine.
This seems to happen more frequently the longer the caller is on hold, usually after about 30 to 60 seconds. It is definitely not consistent though.
When the inbound caller is first placed on hold they get the SPA9000 generated music, just fine. If we loose the audio in the outbound direction and we subsequently place them on hold they do not get the music on hold.
Its as if one or both sides have forgotten the address of the other side.....
Any suggestions? My ITSP support in the past has been very good and I can enlist their help if needed.