مكتبة القرطاس

مكتبة القرطاس برنامج مجاني مفتوح تعمل على جميع أنظمة التشغيل لينكس او وندوز أو ماك تتيح لك مطالعة الكتب و تحريرها كما يمكنك إضافة كتب جديدة

Today’s small-to-medium-sized (SMB) businesses and large enterprises are saving on their monthly communications costs by making one simple decision: to switch to a VoIP service solution from their old, outdated Plain Old Telephone Service (POTS). By choosing a new VoIP service, these companies enjoy the flexibility, reliability, call features, and audio quality that only a VoIP service can provide. Plus, they cut their phone bill by up to 70%!