US PATENT SUBCLASS 379 / 209
.~ Repetitive call attempts (e.g., camp-on-busy, retry)

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379 /   HD   TELEPHONIC COMMUNICATIONS

201  DF  SPECIAL SERVICES {9}
209.~ Repetitive call attempts (e.g., camp-on-busy, retry)

DEFINITION

Classification: 379/209

Repetitive call attempts (e.g., camp-on-busy, retry):

(under subclass 201) Subject matter which includes producing successive repeated call attempts.