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Call drop issue when using SIP trunk as secondary and E1 as primary path

Hi All

I have configured cisco 2811 router as a voice gateway. I have two connection for PSTN access 1st one is E1 (TDM) & 2nd one is SIP (IP) path. at CUCM 7.0 i have added VG as H323 gw . i  m using fast start for h323 and early offer for sip with mtp . all inbound and out bound is working properly when both dialpeer preference 0 or SIP is 1st prefenece.

But the problem is when i m configuring preference 0 at pots (E1) and preference 1 at voip (SIP) , SIP will be backup path for E1 . when all E1 channel is busy then calls are going through the SIP, ringing and after reviceing the call its disconnecting after 8s.

Please guide me how can i solve the issue.

Please find the attached file for my GW configuration