Possible causes of VoIP problems

Hi all,
What are the probable causes of VoIP flaps..??
We are having IP phones (Cisco 7960G and 7940G) installed at our place..
From last 1 month we are facing lots of voice issues..like below
1) Sometimes while users are attending their calls on IP phones,the IP Phones inadvertently goes in initial configuration mode like "Configuring IP" and users get disconnected from their voice application. After that further processing goes about and after that the voice issue is automatically solved...
2)The IP Phones boot on their own..
3) Sometimes while doing the imaging (Ghost) of Operating systems or some other Applications, IP Phones face the same problem...i.e. go into initial configuration mode...
Important thing to notice is that during this voice problems, there is no data issue seen. PCs work fine ..only the voice gets affected...
We were not facing such problems earlier..but this is happening from some 15-20 days.
Could anybody help with this???
Parag Patil

Hi,
Thanks for the reply..
You told this might be due to ghosting software packages on the network with lots of 7905 IP Phones...But we are using 7960 and 7940 Ip Phones..And sometimes, we don't face problems on the locations where software are installed using ghosting...and sometimes yes...
It's really a conundrum to understand the reason...
Currently we are using 7.1 SIP version...
The Problems come unexpectedly and goes solved automatically...
Is there any bug in 7.1 version??If yes..upgrading to which version could solve this problem??
Awaiting your valuable reply,
Parag

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