Disclaimer Samsung Business Communications is not responsible for errors or problems arising from customers not installing, programming or operating their Samsung systems as described in this manual. Copyright 2005 Samsung Business Communications All rights reserved.
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259 Gongdan-Dong, Gumi-City Kyungbuk, Korea, 730-030 (factory name, address) declare under our sole responsibility that the product Digital Keyphone System "OfficeServ 7200" / IP MODEM "LXM-300Q" to which this declaration relates is in conformity with RTTE Directive 1999/5/EC ( Annex II )
Intended Use This telephone system is intended to provide the user with voice communication between the system extensions and connection to the public switched telephone network by digital or analogue links. The telephone system may be provided with the ability to communicate with local computer networks to provide CTI functions and features.
Guide Content and Organization This guide consists of four chapters: CHAPTER 1. Introduction to the OfficeServ 7200 Describes the features and functions of the OfficeServ 7200 and provides an over- view of the system architecture, interfaces and programming. CHAPTER 2. OfficeServ 7200 Hardware Describes the OfficeServ 7200 hardware including chassis configuration and the func- tions and configurations of the functional modules.
NOTE Indicates additional information as a reference. References Samsung OfficeServ 7200 Installation Guide This guide provides installation procedures for the OfficeServ 7200 keyphone sys- tem. Trademarks Product names mentioned in this document may be trademarks and/or registered trademarks of their respective companies.
Programming ........................1-8 CHAPTER 2. OfficeServ 7200 Hardware Hardware Features ......................2-1 Chassis Configuration ..................... 2-2 Rear Panel of the OfficeServ 7200 ................2-4 Functional Modules ......................2-5 Control Modules......................2-5 Voice Trunk Line Module ................... 2-9 Voice Subscriber Line Module ................. 2-14 Data Modules......................
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OfficeServ 7200 General Description Guide Table of Contents Station Phones........................ 2-27 Analogue Phones ....................2-27 Digital Phones......................2-27 IP Phones ........................ 2-30 Add-On Module......................2-31 Keyset Daughterboards................... 2-31 Door Phone and Door Phone Interface Module ............2-32 Wireless LAN Equipment....................2-32 Wireless LAN Base Station (WBS24) ..............
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Table of Contents OfficeServ 7200 General Description Guide CHAPTER 4. OfficeServ 7200 Functions Call Functions ........................4-1 Dynamic IP Address Allocation .................. 4-1 VoIP UMS Interface ....................4-2 SIP Server Interface....................4-2 Router ALG Interface ....................4-3 VoIP Functions ........................4-3 VoIP Network ......................
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OfficeServ 7200 General Description Guide Table of Contents LIST OF FIGURES Figure 1.1 Service Structure of the OfficeServ 7200 ............ 1-4 Figure 1.2 Interfaces between the SIP Components ............ 1-8 Figure 2.1 OfficeServ 7200 Chassis Configuration............2-3 Figure 2.2 Rear Panel of the OfficeServ 7200.............. 2-4 Figure 2.3...
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Table 2.19 Ports and LEDs of the SVMi-20E..............2-25 Table 2.20 I/O Voltage of the PSU ................2-26 Table 3.1 Capacity of the OfficeServ 7200..............3-1 Table 3.2 Trunk Line Capacity..................3-2 Table 3.3 Station Line Capacity..................3-2 Table 3.4 Electrical Characteristics of the T1 Trunk Line..........
The major functions and features of the OfficeServ 7200 are described below. Integrated Communication Environment The OfficeServ 7200 makes voice calls and sends/receives data using LAN / WAN modules. Integrated wired/wireless devices (phones, PCs, servers, mobile phones and peripherals) are used for communication.
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The OfficeServ 7200 uses a combined Access Point (AP), which offers services by separating the data from voice, and supports handoff and QoS. Because the OfficeServ 7200 uses a wireless LAN base station, it allows users to make wired/wireless voice/data communications or access the Internet without establishing the LAN.
- For information on how to use each application, refer to the relevant User’s Guide for each. Easy Installation and Expandability The OfficeServ 7200 is easily installed: the basic chassis and expansion chassis are mounted on a 19-inch rack. Multiple service modules can be installed in universal chassis slots.
IP Phone (WIP-5000M) Laptop Figure 1.1 Service Structure of the OfficeServ 7200 Voice Trunk Line Part The voice trunk line part is configured with digital trunk lines and analogue trunk lines. The TEPRI modules interface the E1, T1, or PRI digital trunk lines and send/receive voice data through the trunk lines.
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BTS (Basic type) is connected to the LAN only and accommodates 40 BTS and 120 subscribers Application Configuration The OfficeServ 7200 has a commercial server on a Linux platform outside of the OfficeServ 7200 chassis which provides the following application software. Mail server...
CHAPTER 1. Introduction to the OfficeServ 7200 OfficeServ 7200 General Description Guide Interfaces This section describes the interfaces between the sub-modules of the OfficeServ 7200 and those between the VoIP elements. Interfaces between the Sub-Modules Table 1.1 Interfaces between the Sub-Modules...
Signal Processing TCP/IP tem manager Access Protocol TCP, UDP IPC Interfaces between the VoIP Elements The OfficeServ 7200 provides a variety of VoIP interfaces: VoIP networking H.323 VoIP gateway SIP VoIP gateway SIP server System SIP User Agent (UA) IP phones...
OfficeServ 7200Hardware This chapter describes the hardware features, chassis configurations and module functions/configurations for the OfficeServ 7200 system. It also describes the ter- minals, wireless LAN equipment and additional equipment available to the system. Hardware is installed as described in the Samsung OfficeServ 7200 Installation Guide provided with your system.
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Maintenance The OfficeServ 7200 hardware is designed to be maintained with ease and safety. The 19-inch rack is designed to maintain sufficient strength. The installing/maintenance technician can connect cables easily using external ports on the front panel.
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Rear Panel of the OfficeServ 7200 Figure 2.2 Rear Panel of the OfficeServ 7200 1 Power switch Switches system power on/off. Power connector between the basic chassis and expansion chassis Connects the power supplied to the basic chassis with the expansion chassis.
OfficeServ 7200, and the LCP, the mi- nor control module. 3.1.1 MCP The MCP controls all the functions of the OfficeServ 7200 and is mounted in Slot 0 of the basic chassis. The MCP performs voice switching, processes signals and manages subscriber terminals.
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Specifications The specifications of the MCP are shown in the table below: Table 2.3 Specifications of the MCP Category Name Specifications Processor MPC855T System clock 50 MHz Package 357P BGA...
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware Front View LINK 1 LINK 3 MISC1 RUN LAN Smart Media LINK 2 MISC2 Figure 2.3 Front View of the MCP The components on the front panel of the MCP have the following functions: Table 2.4 Ports and LEDs of the MCP...
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide 3.1.2 LCP The LCP is the minor control module that controls a variety of line modules and sends/receives information to/from the MCP. Front View LINK1 LINK3 LINK2 Figure 2.4 Front View of the LCP The components on the front panel of the LCP have the following functions: Table 2.5 Ports and LEDs of the LCP...
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware Voice Trunk Line Module This section describes the modules that offer the voice service of trunk lines. 3.2.1 TEPRI The TEPRI module provides the digital trunk line. A TEPRI module provides E1, T1, or ISDN PRI and functions as the Q-SIG.
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Front View SYNC ASI IPC TP1 CLK TP2 T1/E1/PRI TEPRI Figure 2.5 Front View of the TEPRI The components on the front panel of the TEPRI module have the following func- tions: Table 2.6 Ports and LEDs of the TEPRI...
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OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware Ports & LEDs Function CLK LED This LED indicates whether this module is a master or slave. - On : The module is receiving the clock signal from the network and is the mas- ter clock source for the system.
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Front View Figure 2.6 Front View of the 4BRI The components on the front panel of the 4BRI module have the following func- tions: Table 2.7 Ports and LEDs of the 4BRI Ports &...
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware Functions as the relay path of caller information. (When caller information is en- tered as 8TRK, connect the RCM – an optional module – with the MCP so that the caller information can be checked in the RCM module.).
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Voice Subscriber Line Module This section describes the modules that offer voice paths for analogue and digital subscribers. 3.3.1 8SLI/16SLI/16MWSLI The 8SLI module has eight ports, the 16SLI/16MWSLI modules 16 ports, for analogue stations.
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware The components on the front panel of the 8SLI have the following functions: Table 2.9 Ports and LEDs of the 8SLI Ports & LEDs Function P1~P8 (ports) Station ports for analogue phones.
OfficeServ 7200 General Description Guide 3.3.2 8DLI/16DLI The 8DLI/16DLI module has 8 ports/16 ports for digital stations. It works with the Samsung digital phones to make voice communication. Specifications The specifications of the 8DLI/16DLI module are as follows: 8DLI module: 8 station ports and 2B+D (two voice channels and one signal...
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware Front View of the 16DLI Figure 2.11 Front View of the 16DLI The components on the front panel of the 16DLI have the functions below: Table 2.12 Ports and LEDs of the 16DLI...
Internet or Intranet. 3.4.1 WIM The WIM module allows the OfficeServ 7200 to transmit/receive data to/from the exter- nal Internet. It offers a variety of external interfaces and ports for connecting with the in- ternal network. One WIM module provides applications and a variety of external in- terfaces.
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware Specifications The specifications of the WIM data module are as follows: One V.35 serial port Two ports for connecting with the external Ethernet network One 10Base-T/100Base-Tx Ethernet port for the DMZ...
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide 3.4.2 LIM The LIM module sends/receives data in the Intranet, and provides a 10Base-T/100Base- Tx interface. It functions as a hub for switching. The LIM module works with the WIM through the internal back panel to provide the VLAN function for supporting QoS.
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware 3.4.3 4DSL The 4DSL module uses VDSL technology to send/receive data to/from the external IP devices in the Intranet. The 4DSL provides the VLAN function to support QoS. Specifications 4 xDSL ports...
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide Voice Application Modules This section describes: the MGI module that converts voice to data and then sends/ receives the data the 4WLI module that uses the Digital Adaptor for Subscriber Loop (DASL) to send/receive voice to/from the phone system and wireless base station the SVMi-20E integrated voice mail module.
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware The components on the front panel of the MGI have the following functions: Table 2.17 Ports and LEDs of the MGI Ports & LEDs Function LAN port Port connecting Ethernet.
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide 3.5.2 4WLI The 4WLI interface module uses the DASL to send/receive voice to/from the phone system and wireless base station. This module decompresses the voice of the G.711 and uses the wireless method of 802.11b WLAN or DECT. The 4WLI accommodates four base stations and one base station can accommodate four channels.
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware 3.5.3 SVMi-20E The SVMi-20E integrated voice mail module provides personal voice mailboxes, fax server functionality, Auto Attendant, in-queue messages for callers in UCD group queues, informal call recording, MOH functionality and Answering Machine Emulation.
PGD LED Power Supply Unit The Power Supply Unit (PSU) is installed in the chassis of the OfficeServ 7200. It supplies -48 V DC power from the external power supply to each module. The power I/O specifications are shown in the table below: Table 2.20 I/O Voltage of the PSU...
CHAPTER 2. OfficeServ 7200 Hardware Station Phones This section describes the types and features of analogue/digital station phones that can be connected to the OfficeServ 7200 system. Analogue Phones Analogue phones used for voice calls are connected to the 8SLI/ 16SLI/ 16MWSLI/8COMBO module ports mounted in a universal slot of the system.
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CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide 21-Button 2-Line LCD Keyset (DS-5021D) 48-character display (2x24) LCD with three associated soft keys and scroll key 21 programmable keys Navigation keys for easy use of keyset func- tions Five fixed-function keys...
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OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware 38-Button 2-Line LCD Keyset (DS-5038S) 48-character display (2x24) LCD with three associated soft keys and scroll key 38 programmable keys Five fixed-function keys Built-in speakerphone Keyset Status Indicator Eight selectable ring tones...
CHAPTER 2. OfficeServ 7200 Hardware OfficeServ 7200 General Description Guide IP Phones Internet (IP) phones use IP addresses to send/receive voice and data. They use ex- isting data network lines, so do not need normal phone lines, and can be connected to devices such as a switching hub.
OfficeServ 7200 General Description Guide CHAPTER 2. OfficeServ 7200 Hardware 21-Button 2-Line LCD IP Keyset (ITP-5021D) 48-character display (2x24) LCD with three associated soft keys and scroll key Supports data and voice transfer using Internet Protocol 21 programmable keys Navigation keys for easy use of keyset functions...
8 Ω to 16 Ω. External Units The OfficeServ 7200 may be connected with external units such as amplifiers or speakers. External units are connected via the MISC1 port of the MCP module to the MIS option module installed in the MCP.
The Station Message Detail Recording (SMDR) manages call data such as calls be- tween station users and local/long distance/international calls. Connect the SMDR printer or SMDR PC with the OfficeServ 7200 to use the SMDR data provided by the system. The precise details provided by SMDR can be programmed in the sys- tem.
Up to 160 lines can be installed and operated in the system, and the ratio of station and trunk lines can be adjusted within the capacity limit, depending on users’ needs. Table 3.1 shows the maximum line capacity of the OfficeServ 7200. Table 3.1 Capacity of the OfficeServ 7200...
CHAPTER 3. OfficeServ 7200 Specifications OfficeServ 7200 General Description Guide Trunk Line Capacity The maximum trunk line capacity of the OfficeServ 7200 is based on its configuration and is shown in Table 3.2. Table 3.2 Trunk Line Capacity Analogue Digital...
OfficeServ 7200 General Description Guide CHAPTER 3. OfficeServ 7200 Specifications 2.1.1 Signalling Type of the Trunk Line Loop Start When processing the loop start signals, the on-hook and off-hook status is con- trolled by the flow of the electric current. The loop is a closed loop trunk circuit or standard 2500-type set loop.
CHAPTER 3. OfficeServ 7200 Specifications OfficeServ 7200 General Description Guide E1 Trunk Line The electrical characteristics of the E1 trunk line comply with the ITU G.703 and the G.704 standards. Table 3.5 Electrical Characteristics of the E1 Trunk Line Category...
OfficeServ 7200 General Description Guide CHAPTER 3. OfficeServ 7200 Specifications Table 3.7 Electrical Characteristics of the PRI Trunk Line Category Specification Transmission speed 2048 kbits/s ±50 ppm Code High Density Bipolar of Order 3 (HDB3) Pulse type Regular square wave : When indicating all valid signals, comply with the mask (I.403) regardless of the codes.
CHAPTER 3. OfficeServ 7200 Specifications OfficeServ 7200 General Description Guide The electrical characteristics of the RS-232C (V.28) interface are shown in Table 3.10. Table 3.10 Electrical Characteristics of the WIM Interface (RS-232C Interface) Category Specification Maximum transmission speed 230 kbits/s Transmission code V.28 driver...
OfficeServ 7200 General Description Guide CHAPTER 3. OfficeServ 7200 Specifications Table 3.12 Electrical Characteristics of the LAN Interface (10Base-T) Category Specification Transmission speed 10 Mbits/s ±50 ppm Transmission code Manchester coding - When the transmission data bit is ‘0’, the higher level of the middle bit is inversed into the lower level.
CHAPTER 3. OfficeServ 7200 Specifications OfficeServ 7200 General Description Guide 2.1.4 Signalling Type of the Station Dial Pulse Signalling Type Ratio = 10 Pulses Per Second (PPS) Make/Break Ratio (M/B ratio) = 33 %: 66 % (can be adjusted in the software).
OfficeServ 7200 General Description Guide CHAPTER 3. OfficeServ 7200 Specifications Transmission Characteristics Attenuation − Attenuation between subscribers : Less than 6 dB − Attenuation between subscriber and local trunk line : Less than 0.5 dB Characteristic resistance of the line : 600 Ω...
For system ring signals, the output voltage is 75 V and the frequency is 20 Hz. The OfficeServ 7200 provides users with various tones to notify them of the status of functions and provide feedback. The on/off cycles of currently specified tones are shown in Table 3.17.
CHAPTER 3. OfficeServ 7200 Specifications Tone On/Off Cycle The On/Off cycle can be adjusted by changing the values in the system software. Available Terminals The terminals available to the OfficeServ 7200 are shown in Table 3.18. Table 3.18 OfficeServ 7200 Compatible Terminals Type Terminal...
Dynamic IP Address Allocation DHCP Client of the MCP The MCP is the call processing control part of the OfficeServ 7200. The MCP uses the DHCP client function to get the IP address allocated by the data server and op- erate.
VoIP UMS Interface Auto Attendant/Mailbox Interface The OfficeServ 7200 uses SIP and RTP, the VoIP protocols, to provide the auto at- tendant and mailbox functions through the UMS and IP network operating in the feature server. To interface with the VoIP UMS, the MGI module should be mounted in the chassis slot of the OfficeServ 7200.
NAT Application Level Gateway (ALG) When functions such as the VoIP signal process function and gateway function exe- cuted through the IP network in the OfficeServ 7200 are executed in the Network Address Translation (NAT) network, the conversion between the private IP address and public IP address should be performed.
SIP equipment (user agent) defined in the RFC3261 SIP standard with the call services of the OfficeServ 7200. The OfficeServ 7200 uses the proxy server function to perform routing for call process requirements such as call setting, call cancel, and call termination through the SIP, which are received from the SIP equipment.
Data Functions The OfficeServ 7200 functions as a router, a switch, performs security functions, or serves as a data network application or data access interface (WAN, LAN, DMZ). Switches...
Routers Network Interfaces The OfficeServ 7200 provides the WAN1 and WAN2 network interfaces (which are connected to the WAN through an Ethernet interface), the serial network connected through the V.35 serial interface, and the LAN and DMZ network interfaces.
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WAN interface using the PPPoE and DHCP client protocols. V.35 Interface (PPP, HDLC, Frame Relay) The OfficeServ 7200 accesses the Internet through the V.35 serial interface with a transfer speed of up to 2Mbps. In this case, the system supports various environ- ments using functions such as PPP, HDLC and Frame Relay Encapsulation.
CHAPTER 4. OfficeServ 7200 Functions OfficeServ 7200 General Description Guide CBQ/BoD (Bandwidth on Demand) The queuing process is differentially performed according to the level table where the routing process priority for a data server is defined. RTP Priority The RTP (Real-Time Transport Protocol) packet is a VoIP media packet. The queu- ing process for the RTP packet is prior to that of other data packets, which helps to maintain the tone quality.
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The data server operates as a VPN client and establishes a VPN channel to re- mote VPN equipment for data transmission. This mode provides the interface between each OfficeServ 7200 based on the IPSec and the 3DES and RSA cod- ing functions.
Data Applications DHCP The OfficeServ 7200 can assign the IP address as a DHCP server. When using the DHCP server in another subnet, the OfficeServ 7200 operates as a DHCP relay. The IP addresses of the IP equipment connected to the OfficeServ 7200 can be eas- ily managed.
RTP protocol of the TCP/IP. Accordingly, the OfficeServ 7200 has superior archi- tecture for capacity expansion and is cost effective, since there is no need for the physical interface required for the existing UMS or VMS.
CHAPTER 4. OfficeServ 7200 Functions OfficeServ 7200 General Description Guide connection is re-attempted for a specific time (provided the ‘Call Forward to the Mailbox for a Busy Line’ function is not set). If the line continues to be busy after the maximum queuing time, a voice message is provided asking the user whether to forward the call to their voice mailbox or disconnect the call.
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OfficeServ 7200 General Description Guide CHAPTER 4. OfficeServ 7200 Functions A subscriber can log in to their own mailbox to listen to voice messages including the message recording time, calling number, and caller ID. The sub- scriber can delete the message, send it to another party or group, or reply to the message after listening to it.
CHAPTER 4. OfficeServ 7200 Functions OfficeServ 7200 General Description Guide Private Mailbox Management The user can record/listen to/delete the name of the private voice mailbox or change the password. The user can also record/listen to/delete the private voice mailbox greeting...
Enter the address of the receiver in this field. Up to six addresses can be en- tered. When entering multiple addresses, enter a comma between each address. (e.g. : abcd@samsung.co.kr, efgh@samsung.co.kr). If the address of the re- ceiver has been registered, click the address from the address list to select.
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CHAPTER 4. OfficeServ 7200 Functions OfficeServ 7200 General Description Guide Enter the addresses of those to receive copies of the mail. Up to six addresses can be entered. Refer to the ‘To’ field above for entering addresses. Subject Enter the subject of the mail. Up to 128 characters can be entered.
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OfficeServ 7200 General Description Guide CHAPTER 4. OfficeServ 7200 Functions Deleted Folder Allows users to temporarily store deleted mails. If the user deletes the mail stored in the Deleted Message folder, the mail will be permanently deleted. Draft Allows users to temporarily store a mail while writing.
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7200. For instance, if the user already has a mail account on a site such as ‘Yahoo’ or ‘Naver’, they can read the mail for the corresponding site in their OfficeServ 7200 mailbox by registering the site in the ‘External Mail Management’ item.
OfficeServ 7200 General Description Guide CHAPTER 4. OfficeServ 7200 Functions Mail Receipt Rejection The user can register the corresponding mail ID to automatically cut off unde- sired mail such as junk mail. The system automatically rejects the mail receipt. Enter the e-mail address for mail receipt rejection (e.g. sago@shopping.com).
CHAPTER 4. OfficeServ 7200 Functions OfficeServ 7200 General Description Guide Notice Management The E-mail user can register or change the notices in their work group. Logo Management The user can register or change a screen from the screens in their work group for the web login screen.
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The user can view information such as the currently busy channel status and web login history. Voice CODEC Selection The user can specify the CODEC format for the voice files of the OfficeServ 7200. The user can select the voice CODEC (WAV, MP3, OGG) to be appended when sending mails.
OfficeServ 7200 General Description Guide Web/System Management The OfficeServ 7200 provides a user interface that manages various functional blocks of the system on the web through a web browser. The system performs the call server configuration management and information retrieving function through the PCMMC package.
This function displays or changes the setting status for e-mail services. System Management Multi-Site Management The user can enter and manage information on the site where the OfficeServ 7200 is installed (addresses, phone numbers, notes, system installation date, administrator, etc.)
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This function displays the various event information in the OfficeServ 7200 such as critical errors, warnings, etc. Access Log Management This function displays the access log for the OfficeServ 7200. The user can group each access log using the arranging and searching function. Traffic Management...
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Abbreviations OfficeServ 7200 General Description Guide Foreign Exchange Office Foreign Exchange Station GARP Generic Attribute Registration Protocol Gatekeeper GVRP GARP VLAN Registration Protocol HDLC High level Data Link Control Home Location Register HTML Hypertext Markup Language HTTP Hypertext Transfer Protocol...
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OfficeServ 7200 General Description Guide Abbreviations Main Control Processor MEGACO Media Gateway Control Media Gateway Media Gateway Controller Media Gateway Interface MGCP Media Gateway Control Protocol Man Machine Communication Metering Pulse Detection Music On Hold Mail User Agent Mail Transfer Agent...
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Abbreviations OfficeServ 7200 General Description Guide Signal Control Processor Session Description Protocol Signalling Gateway SGCP Simple Gateway Control Protocol SIGTRAN Signalling Transport Session Initiation Protocol Single Line Interface Single Line Telephone SMTP Simple Mail Transfer Protocol Server optimized Linux Spanning Tree Algorithm...
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