What is VoIP? Video Lecture
VoIP carries the conversation over an IP network instead of a copper line. SIP manages the session; IP phone and IP switchboard are the end and center devices of this network.
VoIP (Voice over Internet Protocol) is the transport of speech in internet protocol packets. The classic home phone connects you to the switchboard with a copper pair; This is called PSTN (Public Switched Telephone Network). In VoIP, the same conversation goes over the data network or internet you already use in the office. Fax, voice message and video sessions can also be recorded on IP using the same logic.
One line is not enough in a business: internal numbers, queues, after-hours reception are required.IP switchboard (IP PBX)manages this. The device on the desk isIP phoneor software client. Product showcase:products, brand exampleYeastarandYealink.
What does SIP do?
SIP is the session protocol that manages the identity, destination and codec negotiation of the call. The audio itself is streamed via RTP most of the time. The “not registered” error is usually on the SIP side;see PCAP/log guidefor diagnosis.
Why is it preferred?
Branch consolidation, working from home and taking the external line with SIP trunk simplifies the cost and installation. Internet quality (jitter, lost packet) affects sound; so QoS and correct bandwidth are planned. If an analog device will remain, an FXS card or gateway is added.
SIP trunking is when the operator delivers the voice line to the switchboard over the internet; It can replace copper PSTN pair. QoS (Quality of Service) is prioritizing voice packets over data downloads; otherwise meeting or backup traffic will disrupt the conversation. Jitter is when packages arrive irregularly; A lost packet is a voice frame that never arrived. Codec (G.711, G.722, Opus, etc.) determines how the audio is compressed; If the two parties cannot agree on the same codec, the call will not be established or the audio will be distorted. If analog fax and old door phone will remain,VoIP gatewayor FXS card will be the bridge. Summary of transition from analog to IP:transition from analog switchboard to IP switchboard.
Next step
technical supportfor capacity selection and installation,dealershipfor commercial channel. A short visual summary is complemented by generator and training videos; The decision is made based on device and trunk topology.