SBC Communications will cut jobs and reduce capital spending in response to lower demand for its core local telephone business. SBC chairman Edward Whitacre Junior made the announcement yesterday at an investment banking conference in Boston. He isn`t giving details about the number or timing of layoffs by San Antonio-based SBC. An SBC spokesman tells the Fort Worth Star-Telegram that the layoffs would be companywide and include cuts in call centers and network centers. SBC plans to add jobs in sales and marketing. The company has about 175-thousand employees. SBC includes Arkansas in its territory. It continues to lose local phone access lines because of increased competition from local and long-distance carriers.