![]() ![]() Probably the coolest feature of all is that as long as one of the SIP phones is registered to the Asterisk box and my landline rings, my SIP phone will also ring. It also handles voicemail and allows me to access it from almost anywhere in the world. One in my lounge and one in each bedroom that can interface with Asterisk (I have run phone cables through the walls) which are not only capable of calling eachother, but provide advanced services only found on professional PBX (Private Branch Exchange) such as call waiting, transferring calls, music on hold, group pickup etc. Now, not only do I have the two SIP phones, but also three phones in the house. Yes, I could very easily just register my VoIP phones (both mobile and dedicated SIP phone) directly to my VoIP provider, but there's no fun in that! It acts as an interface to both my BT line and provides me with VoIP lines. I run Asterisk because of my travels abroad. I hope this clears some of the issues up. In comparison, Pulse Dialling simply sends "pulses" (which can be heard as small clicks on the line) to create the same effect. These tones are transmitted down the line where the exchange "hears" them and can understand what number you are trying to call. When you press a button on your phone, it generates a tone (actually, two tones, which is where Dual Tone Multifrequency - DTMF - comes from). The reason it's called tone dialling is because a phone in itself is incapable of doing anything but relay audio in a duplex fashion from the phone to the other end. VoIP lines don't really have a concept of dial tone or tone dialling because they use UDP to signal the number required to the VoIP provider which then sets up the link for you. The only exception is, of course, if you have your own PBX (like I do - my Asterisk box) and then you will have to generate it for the extensions coming off that. The dial tone is generated by the exchange of your service provider (BT in the UK, for example) and you shouldn't have to generate it. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |