Multicast Traffic on Cisco Router for PBX Conferencing and Paging

[pbxnkey]

I have a customer that has an IP PBX (Site A) with a remote site (Site B) with IP phones registering to Site A.
They have an MPLS network. I configured GRE tunnels on the Cisco routers for the Multicast traffic. The paging is working but the conferencing is partially working. When Site A tries to conference a phone at Site B, Site A can hear Site B BUT Site B cannot hear Site A.
Inter-office calling works, it's just conferencing.

Here is the config from both sites:
Site A (Where PBX resides):
ip multicast-routing

interface Loopback1
ip address 10.250.250.10 255.255.255.255

interface Tunnel1
ip address 192.168.30.1 255.255.255.0
ip pim sparse-dense-mode
tunnel source Loopback1
tunnel destination 10.250.250.30

interface FastEthernet0/0
ip address 10.10.10.100 255.255.255.0
ip pim sparse-dense-mode

ip pim bidir-enable

ip mroute 10.10.30.0 255.255.255.0 192.168.30.2

Site B:
ip multicast-routing

interface Loopback1
ip address 10.250.250.30 255.255.255.255

interface Tunnel0
ip address 192.168.30.2 255.255.255.0
ip pim sparse-dense-mode
tunnel source Loopback1
tunnel destination 10.250.250.10

interface FastEthernet0/0
ip address 10.10.30.1 255.255.255.0
ip pim sparse-dense-mode

ip pim bidir-enable
ip mroute 10.10.10.19 255.255.255.255 192.168.30.1

Any Suggestions?