Would anyone know these? Especially the ringback. I've tried 311, 220, 990, 958, 980, 999, etc. No luck. 958 & 311, for example, ring once, then makes a tone like: "doo-doo-doo silence doot." 980 disconnects the phone for about a minute. I've searched Google but found nothing but nearly 15-year-old (useless!) 2600 archives.
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