I have one branch which is (branch-1) with two groups of ip phones, one group is connecting to CUCM-1 in HQ and the other group is connecting to CUCM-2 in the branch (branch-1) and the connectivity between HQ and branch-1 is through IPsec and the link between CUCMs is SIP trunk with default configuration and they are working fine,
Then I have branch-2 which also have two groups of ip phones connecting to CUCM-1 in HQ and CUCM-2 in Branch-1 but when i call from a phone connecting to CUCM-1 to CUCM-2 it can ring and when I answer i can't hear any thing. ++++++++++++++++++++++++++++++++++++++++++++++++++++
HQ connecting to branch-1 through IPsec
HQ connecting to branch-2 through IPsec
Branch-1 is connecting to branch-2 through IPsec.
CUCM-1 located in HQ
CUCM-2 Located in Branch-1
SIP trunk configured in between ++++++++++++++++++++++++++++++++++++++++++++++++++++
Who can advise what's the problem ??