I have a WAN with three locations. HQ, Dallas, and Boston. There is a VPN 3005 in HQ the connects the two other locations. Dallas has a ASA and Boston has a PIX, both connected using IPSec back to HQ.
I also have a VOIP system in all three locations. HQ can connect to both remote locations, but the VOIP system in Dallas cannot connect to the VOIP system in Boston. It uses UDP 5440. The two remote offices can ping eachother and other TCP communication works.
As far as I can tell, I have no filters or access control lists that would be blocking this. Any ideas?