Anyone named as cross-defendant who is NOT already a party to the action must be personally served with a summons on the cross-complaint, along with the cross-complaint itself (the same procedure as with a complaint). Parties already existing in the lawsuit are simply served with the cross-complaint (mail is fine).
From your question, it seems you've filed a cross-complaint against the plaintiff who sued you (who's clearly already in the action), so no summons is necessary.
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A Summons On Cross-Complaint is not necessary if the sole cross-defendant is the plaintiff in the same case. A Summons on Cross-Complaint is only necessary if new/additional parties are being brought it. Otherwise, service of the future pleadings on counsel of record is sufficient.
Frank W. Chen has been licensed to practice law in California since 1988. The information presented here is general in nature and is not intended, nor should be construed, as legal advice for a particular case. This Avvo.com posting does not create any attorney-client relationship with the author. For specific advice about your particular situation, please consult with your own attorney.
I agree with attorneys O'Brien and Chen.
Legal disclaimer:This message does not constitute legal advice and does not create an attorney-client relationship. Any statements are made for general informational purposes and do not constitute legal advice. No attorney-client privilege is created by this communication. Attorney is licensed in California only.