SJPhone - это так называемый софтфон, то есть, программа для телефонных звонков через VoIP. Аналогично Skype, SJPhone позволяет общаться через Интернет по голосовому каналу. В отличие же от Skype, SJPhone использует для связи стандартный протокол SIP, использующийся в большинстве VoIP приложений и стационарных VoIP телефонов.
Поскольку протокол SIP - открытый стандарт, то и сервисов, работающих на основе него, предостаточно. Зарегистрировавшись на любом понравившемся SIP-сервере, можно совершать звонки на стационарные и мобильные телефоны по тарифам, выгодно отличающимся от тарифов мобильной и обычной проводной телефонной связи. А звонки на другие SIP-телефоны будут и вообще бесплатны.
Всё это становится возможно при использовании аппаратного VoIP телефона, или с помощью SJPhone.
Доступны также различные "вкусные" возможности, например, переадресация вызова: при получении входящего звонка SJPhone наберёт другой, указанный Вами номер и перенаправит звонок на него. Это удобно, если Вы, уходя от компьютера, хотите получать все звонки на мобильный телефон.
Кроме возможности совершать голосовые звонки на любой VoIP телефон или софтфон, SJPhone позволяет общаться текстом, используя также открытый протокол Jabber.
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