Ah, yes. The point in JEXTX's response is worth noting too - for the suspended corporation to respond, it must first reinstate.
OP - you might benefit if you explianed more about what you're doing. To come back from suspension, the subject corporation effects a "revivor" by getting a certificate of revivor from the FTB. The State or the FTB or both can suspend. I don't know the actual numbers, but I've had some experience. My guess is that less than 10% of those suspended by the State effect a revivor and possibly less than 5% of those suspended by the FTB. If there has been an FTB forfeiture, think in terms of less than 1%. For companies suspended by the State, it's a matter of filing delinquent paperwork and paying fees. For those suspended by the FTB, it's a matter of paying delinquent taxes. It's easier to junk the corporation and start a new one. In my experience, that happens more frequently than there are revivors.
As a practical matter, if you're serving a suspended corporation, it's very likely that you'll get a default judgment. If you know that you're suing a suspended corporation and you hope to get a judgment that you can collect, it's time to start looking for assets now. If the corporation is still operating (and there's a lot of that too), it's appropriate to figure out how you might shorten time to effect recovery. Is your main concern service or recovery?