Call Droped Out on VOIP

Hi, We have using Cisco UC520 Router with two analog line,(voice-port0/1/1) & (voice-port0/1/0) when anyone made calls on (voice-port0/1/1) means All incoming call which are coming on (voice-port0/1/1), it's diverted to 206 (ext.). If anybody are unable to receive call on 206 within 15 sec. then call Automatic divert to my Mobile from (voice-port0/1/0) & when anyone made calls on(voice-port0/1/0) means All incoming call which are coming on (voice-port0/1/0), it's diverted to 202 (ext.). If anybody are unable to receive call on 202 within 15 sec. then call Automatic divert to ext. 206 then my [login to view URL] we have some issue,im still getting call drop outs, when i tried to pickup call on mobile, I am getting a lot of call drop out with the phone system at the moment, Can anyone help me on this issue. Thanks ## Deliverables 1) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No 3rd party components unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the worker's Worker Legal Agreement). ## Platform Cisco UC520