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Voice delay across GRE Tunnel inside IPSEC tunnel

I have 2 Callmanager 8.5 system in different states that are connected over a VPN. We run a GRE tunnel inside the IPSEC VPN and have an inter cluster trunk setup. However when calls are routed between the 2 sites, there is a several second pause in the audio stream at the begining of the call, the report is about 4 seconds of dead air before the callers can hear eachother. After this delay then there is no issue at all with the call. We are running QoS and keep alives on the GRE Tunnel so I am not sure where the problem might be coming from.

Any help would be greatly appreciated.

Thanks,

Michael

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