VOIP Phone Multicasting

I am having difficulty getting two routers to pass multicast traffic between them. A brief config:

Router A
Inside - 172.25.0.254/24
Outside - 172.26.0.253/24

Router B
Inside 10.20.10.254/16
Outside - 172.26.0.254

IP traffic routes and passes correctly. I’ve tried setting them up as IGMP proxies with Upstream turned on and off, as well as adding the additional Alternative Subnets on both ends, with no success. I’ve also tried setting up PIM like the example at http://wiki.mikrotik.com/wiki/Manual:Multicast_detailed_example also with no success. IGMP Groups always shows exclude for the state. Can anyone offer some suggestions?