SIP Soft - VoIP Turns Into A Softswitch

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In a traditional small business CPE [Customer Provided Equipment] situation, the PBX [Private Branch eXchange] or KS-KSU [Key System Unit] often provided the voice and data interface. While this is complicated, in the following sections, we will review individual elements of the technology and subsystems. Since this subject is quite complex, key topics have been divided into smaller topics. This section shows the CPE [Customer Premise Equipment] telephone and computer devices which are connected to the IAD [Integrated Access Device]. The IAD provides voice line interface to the customer’s telephone and computer systems such as a LAN [Local Area Network] equipment. To begin the telephone call, the IAD uses RTCP [Real-Time Control Protocol] to provide voice signaling, setup and call supervision. An RTCP is sent to the telephone company, and then an RTCP packet is sent to the telephone company. Then, the telephone company router sends the RTCP packet to the SIP [Session Initiation Protocol] Proxy Server which creates an SS7 [Signaling System 7] IAM [Initial Address Message] packet. The SS7 packet is sent to the SCP [Service Control Point] database to retrieval call routing information. Once the voice routing information is received, RTP [Real-Time Protocol] is used to transport the voice conversation. In this case, the packetized voice converted to traditional TDM [Time Division Multiplexed] channelized voice for connection to the PSTN [Public Switched Telephone Network]. Another key point is that simultaneous with the voice packets are data packets can be sent to the internet or other data networks. In addition, IF there are no voice calls, the unused bandwidth can be used for faster data transmission. This means the bandwidth is dynamically assigned to voice or data applications.

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