How to set up call forwarding in ip-telephony?

Question

Telephony

Is available:
IP telephony from house.ru
Cisco spa122
2 analog phones, with internal numbers.
How to set up forwarding from one to another? i.e. someone called, we answered him on one phone, and then forwarded to another

Answer 1

This is usually done using a virtual PBX. 2 sip accounts have an internal number, for example 101 and 102. On a virtual PBX, we set up a number translation - a grid, for example, or "0". We press this symbol, Wirth. The PBX understands that one of the numbers wants to make a transfer, the call is put on hold, then we dial the number of another sip account and it goes there.
In general - kick support for dom.ru, but the meaning is the same - sip accounts have an internal number, you need to learn how to transfer calls to these numbers.

Answer 2

forwarding is when you turn it on once and all calls to your number will immediately go to the destination number of the transfer. Like, number 100 forwarding to number 200 is enabled. So if you call 100, then 200 will immediately call.
You need a transfer. What would you answer and transfer the call to your second number. That is, you answered 100, said "ale", and then pressed a couple of buttons and the call will be transferred to 200.
What telephone set do you use? Dect tube? Analog Panasonic? Write a model.