If this is forwarding to the answering machine on YOUR phone, from the intercom dial *713xx where xx is a number of seconds. I think by default it's using the system number of 40 or 45 seconds. Try 24 for 4 rings (or multiply the number of rings by 6 and you get seconds).
If you're talking about SYSTEM rings before the VM, it's a different story and it requires system programming.
Carl
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