Symptom:
Call Duration incorrect timing in MX 300 G2

Conditions:
Steps to Reproduce :
1.	Register MX300G2(5303) video phone and IP Phone A (5130) , IP Phone B (5112) in Unified CM 
2.	Make call from MX 300G2 to IP Phone A  put call hold in MX300
3.	Try to transfer the call from MX 300G2 to IP phone B but not making transfer call end the transfer  call in MX300G2 
4.	Then resume the hold IP  Phone A call In MX 300G2 

Problem Description :  when call put on hold in MX 300 the call duration will goes from the beginning  but when trying to transfer and ending the transfer call and checking the hold status in Monitor of MX 300 it starts from the beginning from (0.00) not resuming to actual call duration 

Expected Behaviour : call duration should match with during hold call duration in MX 300 G2 but in touch it displaying correct call beginning time 

Environmental  Matrix : 
SX20 : s52010tc7_2_0_rc1.pkg