IP Phone keeps ringing forever after incoming call on FXO Port,

I am using CUCM 8.6 and MGCP GW and I have 2 problems

 a) I'm calling from my mobile (on the PSTN) to the FXO port and after
it rings once for me on my mobile phone the line gets connected and i
can hear a dial tone for 10 secs exactly (similar to a dial tone when
you pick up a phone to dial a number) and my cell minutes are already
being used and then after exactly 10 secs i can hear the ringing of the
remote phone on my mobile phone and can also see the ip phone start
ringing as well. b)
 now as a continuation to the problem (a), once my ip phone starts
ringing and if i happen to hang up my mobile phone, the ip phone keeps
ringing forever....
Any help will be much appreciated

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Received on Fri Aug 17 2012 - 03:59:52 ART