I.1. MAKING CONTACT
I.1.A. Asking for someone. Greeting. Introducing.

Good afternoon. Alfa Enterprises.
PIC Enterprises. This is Mr Smith speaking.
Speaking.

Could I have extension 303? / Extension 303 please?   
What is the dialing code to France?/ France dialing code, please.
Hello! Is that Mr Petrov? 
Could you put me through to Mr Peev?
Could I speak to Mr Serov / Mrs Serov.
I’d like to speak to Mr Jones / Mrs Jones, please.

Who shall I say is calling?
Can I ask, who is this?
Who’s calling please?
Could you hang on? /I’ll put you through now / I’m putting you through. I’ll put you through to him / to her.

Sure. Thanks.
This is Ivan Todorov.

I am Peter Smith from PIC inc. 

I.1. B. Possibility/impossibility to realize a conversation. Reason for calling.                

It’s fine. I’m listening.
I’m rather busy just now / Sorry, I don’t have time.
How can I assist you?
Can I help you? / What can I do for you? / How can I help you?
What are you calling about?
Is this a good time for you to talk now? / Can we talk now?
I understand.

I need some information.
I’m calling you about/ regarding in regard to the vacancy of telephone operator.
It’s for the vacancy of telephone operator.
I’d like more information.

I.2. Absent or indisposed.

Just a moment please. The line’s engaged / busy.
Hold the line please.Please hold / Hold on please.
I’m sorry, Mr Jones / Mrs Jones is out at the moment. He is absent / She is absent.
He / She is indisposed / He / She is not available.
I’m sorry, he / she is in a meeting / on a mission.
We were cut off.
Please call back later.
Could you call back in an hour?
Would you like to leave a message?
  

Can I leave a message?
I’ll call back later. Thank you.
I’ll try again later.