@Hainh 

It's only available in standalone mode. I can't find it in controller:

  @Hainh 

I don't think the IGMP proxy works on the ER605. It certainly does NOT support BT TV despite being configured on the router.

if you can get it to work, please let me know how!

  @mhoam 

I resolved my IPTV problem by adding a secondary connection the WAN definition.

My ISP (BT in the UK) requires a PPoE connection to access the internet but this does not pick up the MultiCast UDP packets which are NOT PPoE encoded. By adding a second connection IP address, the ER605 was able to pick up the Multi-Cast packets and so my STB was able to show the IPTV channels

hope this helps