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Yes, this can be accomplished in Genesys Cloud, but not by assigning the DIDs directly to individual phone extensions alone.

A common approach is:

1. Create a User Group (or Group Ring) containing the four users/SIP phones.
2. Create a Call Flow in Architect for each DID.
3. Route the incoming DID call to the primary user first using Transfer to User.
4. Configure the transfer timeout to 30 seconds.
5. If the call is not answered, use the failure/no-answer path to transfer the call to the group, queue, or a routing method that rings all four phones simultaneously.

Alternatively, if all four phones should ring after the initial 30 seconds, you could:

• Transfer to the primary user.
• On timeout, transfer to a queue configured with simultaneous ring or alerting for all four members.

One thing to note is that Genesys Cloud does not natively support a "ring one DID-assigned phone, then automatically expand ringing to other unrelated phones" configuration directly on the user or phone object. This behavior typically requires an Architect inbound call flow to control the no-answer logic.

In summary: Yes, it is achievable, but the DID should be routed through Architect, where you can ring the primary SIP phone for 30 seconds and then transfer the call to a group or queue that alerts the remaining SIP phones.

Thanks,