Usage: channelgroupdelperm cgid={groupID} permid={permID}|...
       channelgroupdelperm cgid={groupID} permsid={permName}|...

Removes a set of specified permissions from the channel group. Multiple 
permissions can be removed at once. A permission can be specified by 
permid or permsid.

Example:
   channelgroupdelperm cgid=16 permid=17276|permid=21415
   error id=0 msg=ok