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We have seen mobile culture. It is a modern  technique. But telephone is also not so ancient or old culture. It has  also its own criteria. It  has its own limitations also to expose before somebody. MObile  always  remains in pocket of the person and  the person has some previlege to avoid the  phone while in  telephone  i.e. landline telephone  which ill be called telephone only has no such  discretion always except the phone4 contains collar id  facilities.  Ring starts and  you have to take  phgone and you can know by asking who is calling. More to more you can say  about availability of the person either from the person directly or thrpough the receiver of the phone.You have no justification whether t6he information given is absolutely correct.  In some well established offices the phone has  connection to other side called parrallel connection or extension services, where t5he receiver will  give the line to the required person.  It isa a polished practice to inform the receiver regarding your required person with the purpose  for which you are calling him. Youn have to expose the situation before receiver first and and at thr discretion of the receiver  the phone goes to the person concern.It may  happen where receiver says directly that the person is not available. I had marked  when my headclerk  having direct line of my phone  was telli9ng the  calling person  directly that saheb is not available or he is busy with some meeting or so  so  so .. any other excuse  but5 he will not transmit the phone  to me. In some cases it nis under my direction and remaining under his own discretion  This is sofisticated way to discard somebodyAnother way to discard is to reply  I will call you latter on  and then never to call again. Some  more way for sofisticated denial is to speak  hallo,   hallo   hallo    oh my god I cant hear anything  something is wrong with phone  it seems not in working order    " and then to put the receiver  and to keep the receiver off.."latter4 on  and calling pereson will get engagaed tone ......

This is sufficient to  follow the criteria of phone