This is a fun one. I need some pointers on where to start.
I have about 15 sites that are all roughly identical in their setup, so 
I know the general design is ok.
This particular site was Sipx 4.2.1 and Polycom 450/550 firmware 3.2.4 
and bootrom 4.3 up until last week.
They are now sipx 4.4 (latest) Polycom 450/550 firmware 3.2.5 and 
bootrom 3.2.5
Cisco 2960 POE 24 port switch
Sipxbridge, Verizon VoIP services, no IP address NATing
Verizon MPLS T1
Everything is QOSd properly. There are no errors on the router or the 
switch interfaces.
Unfortunately, the problems remain even after the Sipx and Polycom upgrade.
There are 16 Polycom 450s and 1 550. The 550 is the receptionist, and 
she answers the bulk of the calls. They were on an auto attendant, but 
decided they wanted a live person answering the calls. That is when my 
problems started.
The path of most calls is answer, park with blind transfer, page with 
paging group, user retrieves call from park on one of the 450s.
 From everything we can tell, they are doing this properly. They are 
experiencing 2 major problems. I am not sure if one is causing the other 
or if they are related.

Problem 1, straight from the Polycom 550 user "About 7-8 times a day 
when the main line rings, I go to answer it and no one is there, but on 
the LED screen the first button says “answer”. You cannot pick up the 
call at all and the caller hangs up and calls back."

Problem 2, also from the 550 user "about 50% of the time the overhead 
can’t be heard, then when you try to use the overhead a second time it 
rings busy"
She is referring to the the paging group. Nobody hears anything. The 
paging call then sits in the active calls list within sipx indefinitely. 
Usually, I will have to restart the paging service to get everything 
going again.

This site seems like a simple setup to me. I have several others that 
are identical. I have tried everything I can think of, so I'm ready to 
start at square 1 again. Can anyone give me some tips?

Thanks as always,
Matthew
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