Silent calls like these often signal persistent cold calling efforts, where no voicemail is left to dodge scrutiny. The automated response on callback, mentioning an 'unavailable' extension followed by a beep, hints at a telemarketing setup evading direct contact. This pattern raises red flags for unwanted solicitations or potential harassment. To handle it, block the number immediately using your phone's settings or carrier tools. Register on national do-not-call lists to reduce such intrusions. If calls persist, report to authorities like the FTC in the US or equivalent bodies elsewhere for investigation. Staying vigilant prevents escalation into more intrusive tactics.
Multiple calls arrived without any voicemail; calling back yields a message that extension 02825509732 is unavailable, then a beep—likely cold calling.