A Voipswitch or softswitch is a very important device element of any
telecommunications network. It connects different IP networks in order to
deliver end-to-end communications
“Call filter” allows blocking/unblocking the incoming calls as easy as to make filtration, it also journalizes all rejected calls. It is very convenient if you do not want to receive a call from some subscribers, when they will call you, “Call filter” will do so that your line is engaged.