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7821 IP Phones goes unregister while making calls

Hi Friend,

We just got a batch of new 7821 IP phones in and i am  trying to register those phones, phones got register successfully with our CUCM (8.6.2.23900-10.  

Firmware version on device default shows : sip78xx.10-1-1SR1-4

I have uploaded latest device pack and Firmware as follows and perform cluster wide reboot 

cmterm-devicepack8.6.2.24120-1.cop
cmterm-78xx.10-1-1SR1-4.cop

my phones are connected in remote site, we have IP sec tunnel from HO to remote site( CUCM resides in HO).

Problem: Call is not successful, when we make a call from HO and pick  up other side 7821 Phone goes unregistered and getting beep sound. 

same results when making call other way around.

even i tested calls between two remote phones ( phones located in same site) same results found.

Highly appreciated if some one can help me.

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