Good Evening

I have a site that has a Site to Site VPN 2860 - 2862. It is a IPSec Tunnel, we are having real issues with SIP between the two sites. Its cauing one way Audio which makes me think it could be RTP UPD Ports not being passed, any suggestions how I can diagnose?

If i link the SIP's via External IP addresses with 'Open Ports of TCP5060 and UDP9000-10999 it works fine.