Slow SIP performance VPN Client to VPN Client

[DLeVasseur]

Using OpenVPN and PFSENSE 2.1-RELEASE

Client1 connected via OpenVPN at remote location uses a SoftPhone to call into network, everything is great crystal clear.  He can call in, we can call him all is good.
Client2 connected via OpenVPN same as above.

Now if Client1 calls Client2 (both are connected at separate locations via VPN) there is a LONG delay.  Around 15 seconds.  Originally I had no communications between the two then I found the box for "allow communications between clients" which made the phones connect, but extremely laggy.  Other than this SIP performance everything else is absolutely stellar.

Any suggestions?