Why does it take a “long time” to start dialing the number entered on the phone?

The telephone system waits 10 seconds after the last digit has been dialed and then starts dialing the number. This is due to the definition of SIP telephony (IP block dialing). The process can be accelerated by pressing #. Many IP telephones also have a button labeled “Dial”. This also speeds up the dialing process after entering the last number.