短信签名档业务
SMS signature file service
以上为机器翻译结果，长、整句建议使用 人工翻译 。
接着，论文介绍了主叫短信回执、短信签名档、被叫短信回执、短信过滤、短信仓库、短信转移六种不同的短信增值业务。
Then, we introduce six value-added services, including calling SMS receipt, SMS Signature, called SMS receipt, SMS filtering, SMS storehouse as well as SMS transfer.
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