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One way audio trough VPN

Hi All,

I'm having issues between two sites that are connected to eachother using Cisco's 887 VA. The phone system is a NEC SV8100 and it connects to several DT700s. The VPN seems to work perfectly fine because I can ping every device from one site to another and also the other way arround. However I'm getting one way RTP flows.

Site A ->
Site B ->

In site A the NEC SV8100 needs NAT so it can be acessible by the SIP trunks.

The problem is that no matter if the call is initiated by Site A or B, Site B does not ear Site A.

I am wondering if I got something wrong on my configuration on any of the Cisco's???
Can you guys see something wrong on the config?

(Configs are attached as image files)

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