BLF(Broadworks) Icons Issue on T48G

[hari908]

I have created the BLF URI in broadsoft r18/r19/r20 server as hari123

From phone's web UI
Go to page
Account ->Advanced
Set BLF List URI to hari123

I am able to see the BLF lines on the phone.
But when i am placing calls to BLF lines from other phone, the BLF line icon showing ringing even after the answering the call. This remains in ringing state even after ending the call on BLF line. The icons get cleared after leaving the phone for 10-15min.

Is there any other configuration that needs to be done?
The same works perfectly on Polycom phones.

Thanks in advance