IP phone 8861 call disconnect while call inprogress

[Mohammad Ramadan A.Hafiez]

Hello,

I have received a call about IP phone 8861 that sometimes diconnect the call suddenly by it self.

I have checked that phone hardware, reset it default but still "Sometimes' disconnect by it self and no errors indication.

Check the switch spanning tree, portsecurity, and port config and no issues.

call disconnects randomely and no specific called or calling number that diconnect with. 

load version sip88xx.14-1-1-0001-125

any suggestions that help me checking the issue cause?

TIA

[Nithin Eluvathingal]

Does this happen for internal calls or external or both internal/external calls.

If this happens with external calls what connection you subscribed with ISP, sip/PRI?

if its PRI, can you share the show controller E1/T1 output.

2.12.0.0

[Mohammad Ramadan A.Hafiez]

So far this occures in internal calls only and noticable for this single 8861 phone only