Multicast to GRP2624


Hi All.
We have some GSC3510 around the place that we are multicasting to successfully. But in a few offices I would like the phones to act as speakers in the same way.
I have setup the GRP2624 with the same multicast settings as the GSC3510 but we are not hearing anything.
Can some point out the missing config I need to get this to work.

Thanks to all who respond.


Do you have the phone programmed to listen for the multicast IP?
Did you reboot the phone after setting the multicast listening address?
Did you set Auto Answer by Call-Info to yes?