أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Yes indeed it is possible. Most smart phones provide builtin VOIP services in it you just have to find it and past the server information. or you can use CSIP application or Beira etc
Yes, depends on the VOIP system and depends on the smart phone and to make sure that it can be installed on it.
most of the VIOP systems support soft phone software