Adapter not ringing

[jyates01]

I have the Obi202 deployed to about 25 users and am finding a issue where the adapter will stop ringing on an incoming call. You can set and watch the Line traffic light flashing quickly, but it will not ring. I tried rebooting the unit, no luck. Finally, I can have the user unplug the phone from line 1 then plug it back in and then it will ring. I know there are calls coming in as they come thru a PBX phone system and I can watch the calls come in to it. All of the users are at different locations. It is happening more and more so I wanted to post to see if anyone is experiencing it. All units are running the most current firmware. Thanks if you can help.

[Ostracus]

Sounds like a sophisticated setup. You may want to give some more info about how you have things arranged.

[jyates01]

Its not really complex. I have calls routed from a PBX system to each end user. Both line 1 and 2 have different SIP accounts, so the call taker can have two simultaneous calls with a multiline phone or 2 separate phones. I am starting to see this issue more and it is troubling. I have the syslog setup to send messages to a logger site I use, and can monitor when calls come in, so I know they are getting to me, we just dont get the ring audio at times.

[zapattack]

What does Call History say? 
How long does it ring before the status shows Ended, and is the time always the same?
If you place a call to the line and it fails to ring the phone, what do you hear?