Hold on to your seat. Here’s a description of SBC Session Initiation Protocol in nonprofessionals terms. It is quite fundamental but must be simply what you need to understand how this VoIP application matches your VoIP system layout plans and feature. After all, not everybody in the business world can talk or recognize geeky talk. SBC – Session based controller. It is that – the main function of SBC is to establish and tear down media audio/video/etc data sessions and likewise to take care of endpoints and other points.
SBC tools communicate usually on UDP port 5060. When one device wishes to begin a contact us to one more, it sends an INVITE message. Included in this is the SDP, session description protocol, which discusses precisely what develop the data, will certainly take audio/video/etc, what codec, etc? When Session border controller concur and are ready to start exchanging media information, RTP real-time transportation method is used to actually trade the information. RTP features on any type of variety of ports, which are appointed to every endpoint. The endpoints bargain and choose acceptable ports on each side. SBC also does a couple of other thing such as REGISTER. Register permits a SBC tool with a vibrant IP to receive calls. An usual usage is an ATA Vonage kind box – when you connect it in, it registers to its server, and restores the registration every XXX seconds to keep the web server up to day in case its IP aments.
Enterprise SBC has a handful of various other features. As an example notify can be used to pass diverse data to an endpoint many IP phones will reboot when you notify them with the data ‘check-sync’. NOTIFY is also utilized for MWI. There is also SUBSCRIBE, which allows an expansion to subscribe to alerts of the standing of a voice mail box for MWI or an extension/channel for BLF. Active light field, things that make a man’s switch light up when he gets on the phone. There are a handful of other SBC functions, as an example REFER transfer, BYE hang-up, etc. SBC has 3 ways of managing DTMF signals sent while the call is in progression:
- Inband- Send the tones as audio in the media stream. works with G. 711 ulaw/alaw codec, other codecs will distort the DTMF.
- RFC2833- Send the tones out of band however still connected to the audio stream by means of RTP.
- INFO- sends the tones as SBC INFO packets along the control channel.