About Voice over IP (VoIP)

SoTCP Operation

Introduction

This section describes the operation of SoTCP protocol. SoTCP provides the

 

encapsulation method for carrying voice traffic over an IP network.

SoTCP Packet The SoTCP protocol terminates voice traffic received from a voice device and

Formatprefixes the traffic with a 3-byte SoTCP header or 4-byte SoTCP header, depending on the version of SoTCP protocol. Figure 3 illustrates the SoTCP packet.

3 or 4 Byte SoTCP Header

Data

 

Figure 3. SoTCP Packet Format

 

The SoTCP header contains information that will allow a destination IP node to

 

reconstruct the voice packet at the remote end.

Transport

 

To carry voice traffic over IP, SoTCP uses two Transport layer protocols, the

Mechanism

Transport Control Protocol (TCP) and User Datagram Protocol (UDP).

Transport

Traffic Carried

Description

Layer

 

 

Protocol

 

 

 

 

 

TCP

Voice Signalling Traffic

SoTCP uses TCP to carry voice signalling

 

 

traffic because TCP provides reliable,

 

 

sequenced packet delivery. Voice

 

 

signalling traffic encapsulated by SoTCP

 

 

must arrive at the destination node without

 

 

error or delay. TCP implements error

 

 

recovery for duplicate or lost packets.

 

 

 

UDP

Audio and Fax

SoTCP transports audio and fax traffic

 

 

over UDP session. Unlike TCP, UDP

 

 

provides fast and simple transaction

 

 

services with minimal protocol overhead.

 

 

UDP provides a best-effort, transport

 

 

mechanism only and does not ensure

 

 

reliable delivery.

 

 

 

Each TCP or UDP session may carry multiple switched virtual circuits (SVCs).

SoTCP uses SVC call setup and routing procedures to establish voice SVCs.

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Voice Over IP

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3Com S200 manual SoTCP Operation, Mechanism, Transport Traffic Carried Description Layer

S200 specifications

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One of the standout features of the 3Com S200 is its versatility. With a variety of ports ranging from 8 to 48, the switch provides ample connectivity options for various devices. This flexibility makes it an ideal choice for businesses aiming to expand their network without the need for extensive infrastructure changes. Built-in support for Power over Ethernet (PoE) enables users to connect and power devices such as IP phones and cameras, simplifying wiring and installation.

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