[Freeswitch-users] ring groups

[Star Wind]

Who can tell me, how I can create a static ring group? I'm using third-party SBC, which changes "Contact" field on every registration, every 15 minutes. That's why I can't use "add-group" and "del-group" dialplan features, because new "Contact" field generates randomly.
All I need - simply ring group, with ring scheme like this:

<phone 1 rings...> - timeout - <phone 2 rings...> - timeout - ... and so on.