Is it permissible for a woman to talk to men online (via text) without her voice being heard, knowing that the entire conversation revolves around the remembrance of Allah and inviting people to Him?

Islam has honored women, granted them their rights, and protected them with the hijab, ordering them to lower their voices and not to speak in a soft, alluring manner. There is no harm in a woman addressing a man via phone, writing, or speaking through public pages, provided she adheres to the শরعي (Islamic legal) guidelines and does not speak in a soft, alluring manner. She must be cautious if she fears falling into Sharia violations. It is preferable for a woman to work with other women, and she is not obligated to initiate calling men to Islam. In this case, averting harm takes precedence over gaining benefits.