Hi,try this command on voip vlan interface.no ip igmp snooping

No, We don't know if it's a config issue or if it's a bug. We have some trouble shouting going on.

Hi,We have the same problem. What we have found out is that the switch only brodcast/multicast the registration packet every 15 minutes.The packets is sent to the "core" switch from access switch(cat3560). If we monitor the trunk port from the access...