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2. Service Structure and User Management

14

AdminGuide-Voss12-1.docx

Structure of SIP Service

Because SIP server of VOSS12 fully follows SIP standards, terminals which follow
SIP standards can be used to work together with VOSS12. Start configuring
following with accurate understanding of SIP service structure.



UAC(User-Agent Client):

Application program or terminal which requests to

send SIP messages (Caller) which ACTIVELY operates to generate/terminate
calls.



UAS(User-Agent Server):

Application program or server which receives

calls from UAC (Callee) which PASSIVELY operates to accept/reject, etc.
There are terminal systems which are included in UA such as SIP phones
and/or GW(Gateway), etc.



Proxy Server:

A router (Application Layer) which forwards

requests/responses of various SIP message from UA to a next node.



Redirect Server:

Informs locations of different SIP servers or UA in which

destined users of requested messages exist.



Registrar Server:

Register and manage users.



Location Server:

A server for recording location of a current system which a

user(registered to a domain server) login to.

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Содержание VoSS12

Страница 1: ...VoSS12 Admin Guide 2012 07 VoLANs Co Ltd...

Страница 2: ...may appear in the document Complying with all applicable copyright laws is the responsibility of the user No part of this document may be reproduced stored in or introduced into a retrieval system or...

Страница 3: ...19 Status Network 21 Status Event 22 Status Active Phone 23 Status Statistics 23 Status Monitor 24 5 Call Log 27 Call Log Current 27 Call Log Log 28 Call Log Call Length Per Day 29 Call Log Call Leng...

Страница 4: ...7 System Monitor 99 System Record 100 9 Security 102 Security Security Config 102 Security ACL 103 10 Maintenance 104 Maintenance Reload 104 Maintenance Reboot 105 Maintenance Factory Default 105 Main...

Страница 5: ...or Main Memory 1Gbit DDR2 SDRAM 2 Storage 512Mbyte Flash Disk LED Status Indicators 2 Bi color LEDs for Board Status Indication 2 Bi color LEDs for Network Status Indication 2 Bi color LEDs for Each F...

Страница 6: ...rface Specifications 2 Pin Tip Ring RJ 11 Connector for each PSTN port Up to 1KV Line Isolation and Surge Protection TX power of up to 10 dBm into 600Ohm Ringing Detection CID Monitoring and Detection...

Страница 7: ...ault button which is connected to a button inside the system If the system lost IP address you will not be able to access the system In that case this button will return the system to factory default...

Страница 8: ...saging RFC 3428 Message Waiting Indication RFC 3842 Presence RFC 3856 Session Timers RFC 4028 INFO Method RFC 2976 SDP SDP RFC 2327 RTP RTP RTCP RFC1889 RTP AVP RFC1890 RTP Payload for DTMF Digits RFC...

Страница 9: ...X Features Voicemail with e mail forwarding Message Waiting Indication IVR Conference RAA Feature Code SIP Messaging Presence BLF PBX to PBX interoperability Codecs Voice G 711 A Law pass thru only G...

Страница 10: ...are not familiar with installing network device contact installation engineer in sales office In this chapter basic installation instructions and safety instructions are mentioned Please read thoroug...

Страница 11: ...In order to prevent damage on the board when you need to touch the board touch the metal part first after then hold the board Before replacing VOSS12 board should be powered off During replacement if...

Страница 12: ...nd output voltage is as below Input AC 100 240V 50 60Hz Power Consumption Max 20Watt Clean the wet floor before installing VOSS12 If the cable is spoiled be careful handling this cable The radius of c...

Страница 13: ...XO Foreign eXchange Office port can use when the port is connected with PSTN telephone line which is connected to PBX or a Key Telephone System One end of cable is connected to FXO port on VOSS12 and...

Страница 14: ...ffect the system operation thus provide power on VOSS12 continuously If all the above conditions are satisfied Connect one end of power cable to VOSS12 adaptor Connect VOSS12 power connector which is...

Страница 15: ...e users which gets services fro VOSS12 VOSS12 configures and manages 3 types of Group individually They are Outbound Group Inbound Group and Call Pick up Group On Dialplan configures dial plans for ea...

Страница 16: ...erminate calls UAS User Agent Server Application program or server which receives calls from UAC Callee which PASSIVELY operates to accept reject etc There are terminal systems which are included in U...

Страница 17: ...stops operating then close the web browser and re log in the web manager This is because the Flash Player sometimes stops playing so this is not the IP PBX system problem Set up PC s IPAddress In ord...

Страница 18: ...s window check Use the following IP address then input default IP address and Subnet Mask and click OK button Figure 3 3 Set up IP Address Login Web Manager 1 Open a web browser then input http 192 16...

Страница 19: ...ed by no type date Call Length Per Day Accumulated Total Call Length per Day Call Length Per No Accumulated Total Call Length per each Number CDR Saved CSV file for Call Detail Records CDR Config Back...

Страница 20: ...p System Monitor Configuration Record Set up call recording configuration with NFS Security Security Config Set up SIP security and Kernel security configuration ACL Add Del Access Control List with I...

Страница 21: ...Frame System Status Table 4 1 System Status Display Menu Item Display Remarks MAC Address Ethernet MAC Address S W version Version No and Build Time Memory Total System memory size Unit MByte Flash D...

Страница 22: ...4 Line Status Display Menu Item Display Remarks Slot Port Slot Port no of Each FXO port Slot Status Status of board connection into a slot Line Status Status of line connection Hook Status Shows On ho...

Страница 23: ...ork View Frame WAN Table 4 6 WAN Display Menu Item Display Remarks IPv4 Address IP address of VOSS12 Version 4 IPv4 Subnet Mask IPv4 Subnet Mask Gateway Gateway address for external connection DNS Tab...

Страница 24: ...og which is total 2000 events If the event is over the limit 2000 then from the oldest event will be deleted to save new event To delete all the event logs click the butt on the following view frame F...

Страница 25: ...y Remarks Extension Display all the extension numbers Name The user name of each extension Profile Applied service profile IP Address Current IP address of each extension Note All the phones registere...

Страница 26: ...s Table 4 11 Statistics Display Menu Item Display Remarks Time File saving time CPU Load CPU load Memory Memory load Status Monitor Status Monitor menu shows the monitoring result for the item enabled...

Страница 27: ...Table 4 12 System Display Menu Item Display Remarks System Items for monitoring Value The result for current monitoring Alarm Set or Unset Alarm Network Link Table 4 13 Network Link Display Menu Item...

Страница 28: ...current Call Display Menu Item Display Remarks Concurrent Call Number Number of current concurrent call Process Table 4 15 Process Display Menu Item Display Remarks Process The process name for monito...

Страница 29: ...Call Table 5 1 Current Call Display Menu Item Display Remarks Caller Caller s Phone Number Callee Callee s Phone Number Start Call starting time Duration The call duration Service Applied service Dial...

Страница 30: ...condition click Refresh button Call Log Table 5 2 Call Log Display Menu Item Display Remarks Caller Caller s Phone Number Callee Callee s Phone Number Start Call starting time Duration The call durati...

Страница 31: ...per Day Display Menu Item Display Remarks Date Date In Count Number of incoming call In Length Total length of all incoming call Out Count Number of outgoing call Out Length Total length of all outgoi...

Страница 32: ...ber of outgoing call Out Length Total length of all outgoing call Total Count Number of total incoming outgoing call per day Total Length Total length of call per day Call Log CDR Call Log CDR menu sh...

Страница 33: ...R Table 5 5 CDR Display Menu Item Display Remarks CSV File Name File name of call detail records Size The file size Time Shows when the file is saved Call Log CDR Config Call Log CDR Config menu is fo...

Страница 34: ...mber of CSV file This system creates a CSV file per day so the maximum number is the same as how many days call detail records are saved in the system The number of maximum Backup File is 60 so the 60...

Страница 35: ...View Frame Record Menu Table 5 6 Call Log Record View Frame Item Display Remarks Recorder The person active this recording feature Caller Caller s number Callee Callee s number Start The time started...

Страница 36: ...ence Voicemail and placing outgoing call though VSP then all the users using the profile will be able to use Conference Voicemail and VSP account to place outgoing calls Adding Profile VOSS12 provides...

Страница 37: ...or not Threeway Select either user 3way call for FXS terminal or not 3way feature is a feature that one FXS terminal is connected with two call then hook flash on FXS terminal then the calls will be c...

Страница 38: ...ined profile Change Profile Information The following information can be changed on this profile menu Dialplan Basic Feature Conference Voice Mail Parking Forwarding Intercom Threeway Virtual Caller I...

Страница 39: ...this system configuration Adding User The users can communicate with their extension number users and place outgoing calls through PSTN or VSP Adding use is divided by two Add and Multi add Adding One...

Страница 40: ...is function Anonymous CID Select either using caller ID display or not If this function is checked and the caller place outgoing call though VSP then the callee can t see the caller ID Name Input a us...

Страница 41: ...heck to use Do Not Disturb function Always Always forwarding all the incoming calls Busy Forwarding calls when the line is busy No Answer Forwarding calls after ring timeout when the user doesn t answ...

Страница 42: ...Basic 40 AdminGuide Voss12 1 docx Figure 6 6 Using Multi Add button 2 Click Muti Add button 3 Then input the required information on the following view frame Figure 6 7 Adding Users by using Multi Ad...

Страница 43: ...e user menu User Provision refer to the above Adding one user menu Ring Timeout refer to the above Adding one user menu DTMF Mode refer to the above Adding one user menu 4 Click Add button on right to...

Страница 44: ...to change 3 Change the information on the following view frame Figure 6 9 User Information View Frame 4 After Change the information click Save button to save the setting Deleting User 1 Go to Basic...

Страница 45: ...c Group VOSS12 has the following 4 types of group and they can be managed on Basic Group menu Incoming Group A group for receiving calls Outgoing Group A group of service line VSP FXO PBX to place out...

Страница 46: ...12 Adding Incoming Group 3 Input a name to be used in this incoming call group and select a type for this incoming group then the Ring Type and Extension menu will be expanded Then select one Ring Ty...

Страница 47: ...up menu Figure 6 13 Basic Group Outgoing Group View Frame 2 Click the Add button on the above view frame Figure 6 14 Adding outgoing Group View Frame 3 Input a name for the new outgoing group and sele...

Страница 48: ...p menu Figure 6 15 Basic Group Pickup Group View Frame 2 Click Add button on the bottom of the above view frame Figure 6 16 Adding Pickup Group 3 Input a name and select pickup as a Type 4 Click Save...

Страница 49: ...18 Adding Intercom Group View Frame 3 Input a name for this intercom group and select intercom as a type Then extension menu will be expanded and choose an extension number for this Intercom Group 4...

Страница 50: ...inging will be stopped Random The Incoming calls will be connected to a random group user Circular Hunt Call Fwd Enabled If one group member set Call forwarding on the user s phone then incoming calls...

Страница 51: ...ll will be forwarded to this number Error Forwarding calls when the system has error Timebased Forwarding calls in accordance to the set time 2 Click Update button to save the setting Change Outgoing...

Страница 52: ...d of DID DOD Member Config Member Config Select a member of this outgoing group among FXO VSP PBX then click Add button To delete a member click X on destined member 2 Click Update to save the setting...

Страница 53: ...mbers will be connected all together Member Config Member Config For intercom group only users can be added To add a user click Add button on the destined user s extension number To delete a user clic...

Страница 54: ...ore deleting the group name delete all the members first by clicking X and click Update button to save the setting 3 Choose the destined incoming group again then click bottom Delete button to delete...

Страница 55: ...ame delete all the group members first by clicking X on each member name After deleting all the members click Update button to save the setting 3 Choose the destined outgoing group again and click the...

Страница 56: ...delete all the group members first by clicking X on each group member And after deleting all the member click Upgrade button to save the setting 3 Choose the destined pickup group again and click the...

Страница 57: ...rs click Update button to save the setting 3 Choose the destined intercom group again and click the bottom Delete button to delete the intercom group Basic Line This menu is to manage connected FXO FX...

Страница 58: ...and Type2 ES Type1 Normal echo cancellation method Type2 ES An Echo Cancellation which is added suppressor So this improves echo cancellation function but can t use Double Talk function VAD CNG Click...

Страница 59: ...he number of times Pause a pause time at the end of disconnect tone play The unit is millisecond Freq Every country uses different Frequency If you want to use a customized frequency which differ with...

Страница 60: ...zing CID information when receiving CID CID Type Set up CID type as Korea Telcordia Erupe ETSI England SIN 227 Japan NTT Echo Cancellation Echo is listening user own voice during a call there are two...

Страница 61: ...card select a slot number on the following view frame and click Reset button Figure 6 30 Selecting Slot View Frame Basic VSP VSP stands for VoIP Service Provider In order to use VSP s service to plac...

Страница 62: ...6 Basic 60 AdminGuide Voss12 1 docx Figure 6 31 VSP Configuration View Frame 2 Click Add button to add a VSP...

Страница 63: ...set as Yes on VSP menu Dial Timeout Input time which will dial automatically after the set time without pressing Send button in seconds Distinctive Ring Header Assign a different bell sound for all t...

Страница 64: ...on Basic SIP menu Use External IP For setting up to use External IP address Max Concurrent Call Allowed maximum number of concurrent calls on this VSP account Max Outbound Call allowed maximum number...

Страница 65: ...w 1 Go to Basic VSP menu 2 Click X button on destined VSP account to delete Figure 6 34 VSP Configuration View Frame Basic Dialplan Dialplan is a feature that enables call routing which is basic featu...

Страница 66: ...ormation on the above view frame Dialplan Config Name Input a dialplan name Pattern Input dialplan pattern by referring appendix B Dial Format This format is to add or delete or create a new number on...

Страница 67: ...d be created beforehand 3 Click Save button to save the setting Change Dialplan Most of information of registered Dialplan can be changed on this menu excluding Name 1 GO to Basic Dialplan menu 2 Clic...

Страница 68: ...rious call related features For example Call forwarding Pickup DND Call parking and so on To use those feature users just need to press a pre registered code called Feature Code on their extension pho...

Страница 69: ...hanged on the above view frame Figure 6 40 Feature Code System Config View Frame System Config Set WAV File A WAV file for playing upon Feature Code set up is completed Reset WAV File A WAV file for p...

Страница 70: ...canceling call forward on busy For example if the feature code is 24 and want to cancel Forwarding feature then dial 24 on the user s extension phone Set No Answer a code for using call forward on no...

Страница 71: ...same pickup group members Redial Last Outbound a code for using to redial the latest outbound number Redial Last Outbound a code for cancelling redial the latest outbound number Set Do Not Disturb a c...

Страница 72: ...ll parking feature For using Call parking feature the user needs to dial 301 on the user s phone and hang up the phone And go to another office room and dial 311 on an extension phone then the user ca...

Страница 73: ...set up user s department Figure 6 45 Organization Configuration View Frame Adding Organization To add an organization add a parent organization first and add sub division and click add button to save...

Страница 74: ...lowing menu To set up SIP related menu follow the instruction below 1 Go to Advanced SIP menu Figure 7 1 SIP Configuration View Frame SIP Config Port SIP number for SIP signaling RTP Port Range Port r...

Страница 75: ...ssions opened on VOSS12 per second Inbound Max Sessions Maximum number of SIP request sessions incoming to VOSS12 For a inbound call needs 2 sessions so if it is set 50 then allows 25 concurrent incom...

Страница 76: ...ton on the above view frame Figure 7 3 PBX Configuration View Frame PBX Config Name Input a PBX name for the remote site s PBX Just need to put easily recognizable name Server Remote site s PBX IP add...

Страница 77: ...r from Alert Info http 127 0 0 1 bellcore dr1 to Alert Info http 127 0 0 1 bellcore dr10 10 kinds of bell sound 3 Click Save button to save the setting Advanced Mail Voice Mail is a service that enabl...

Страница 78: ...Greeting Message 0 is applicable on this configuration Skip Interval Set up an Interval for waiting caller s response after playing Voicemail IVR Max logins Set up the maximum number of log in trial...

Страница 79: ...ng menus Conference Config Name Input a name of this new conference Extension Input the conference number extension to be connected by dialing Password Use this when authentication of password is need...

Страница 80: ...The list of current configured room will be displayed 3 To change the information click the destined name of Conference room 4 Change the information on the following View Frame Figure 7 7 Change Con...

Страница 81: ...conference room name Advanced IVR VOSS12 provides Interactive Voice Response feature that allows the users can be connected to an extension user without interruption of operators IVR Default Configura...

Страница 82: ...going to be routed to the selected destination Invalid WAV File A message to inform the caller that the number is wrong Timeout WAV File A message to inform the caller that max waiting time for digit...

Страница 83: ...played not IVR Default Config category Working Time Off Time Lunch Time Input Timeout Application Type Select an application type for each time The followings are application types User Group accordi...

Страница 84: ...y a destined IVR Temporary Holiday Application Type Choose an application type for temporary holiday among User Group IVR Menu IVR Hang up Holidays Set up the date of the holiday 3 Click Save button t...

Страница 85: ...be used for authentication 3 Click Save button to save the setting Figure 7 13 Adding RAA View Frame Advanced Incoming Dialplan Incoming Dialplan is a feature to connect an inbound call to a certain...

Страница 86: ...ssion For Perl expression refer to the Appendix B Group Name select a incoming group If nothing is selected then this pattern calls will be rejected 3 Click Save button to save the setting Advanced Ph...

Страница 87: ...ook menu 2 Click Add button to add a new number on the following view frame Figure 7 16 Phone Book View Frame Figure 7 17 Adding Phone Book View Frame 3 Click Add button after choosing a number and in...

Страница 88: ...7 Advanced 86 AdminGuide Voss12 1 docx Figure 7 18 Adding Completed on Phone Book View Frame Advanced Emergency No 1 Go to Advanced Emergency No menu 2 Input an Save emergency number and click Add...

Страница 89: ...7 Advanced AdminGuide Voss12 1 docx 87 Figure 7 19 Emergency Phone No View Frame Figure 7 20 Adding Emergency Phone No View Frame...

Страница 90: ...em Network menu Figure 8 1 WAN Configuration View Frame WAN Config WAN Link Set up communication speed and type Note VL Series does not support 10M for link speed WAN Type Select use Static IP or DHCP...

Страница 91: ...ew Frame LAN Config LAN Link Set up communication speed and type Note VL Series does not support 10M for link speed NAT Port Range Set up NAT port range IPv4 Address Set up LAN IP address IPv4 Subnet...

Страница 92: ...nged IP address can be identified by DNS This type of service is called DDNS and the service can be easily used by subscribing to DynDNS org etc http www dyndns org Note DDNS Call Delay may cause call...

Страница 93: ...lick Browse button to browse a related music file for MOH and Much On Ringback Figure 8 5 MOH upload View Frame 3 Click Update button to save the setting System Time A lot of features on VOSS12 are cl...

Страница 94: ...DST Start Time Input Start Time of DST as in order of Month Day Hour Minute DST End Time Input End Time of DST as in order of Month Day Hour Minute NTP Config NTP stands for Network Time Protocol whic...

Страница 95: ...ther system Name input a name for this system Web Port Config A port number to connect Web manager Web port a port number for HTTP Default 80 HTTPS port a port number for HTTPS Default 443 Web Languag...

Страница 96: ...er setting up click Update button to save the setting System Admin Authority On this menu Admin can assign authorizes to use specific menus for users The admin authority means assigning each menu s au...

Страница 97: ...in Authority View Frame 2 Click Add button on the right bottom then a view frame will be popped up And set up the followings Authority Group Config Authority Group Name Input an authority group name W...

Страница 98: ...thority menu 2 Select a destined group name on Authority Group Name 3 Change menus on Write Authority for read only menu uncheck the menu and to give authority check the box 4 Click Update button to s...

Страница 99: ...on View Frame SNMP Config Mode Check either using SNMP or not Read Community Set up SNMP read community value 1 Click Update button to save the setting System QoS Port Fwd To guarantee the bandwidth V...

Страница 100: ...ll be guaranteed Max Data Bandwidth Maximum bandwidth for Data Port Forward Description Name for this port forward management Protocol choose a protocol for this port forwarding External Port a port f...

Страница 101: ...arm to use Alarm feature For this alarm feature if the condition meets the standard then system alarm the systems status by playing internal beep sound System network Concurrent Call Monitor to use sp...

Страница 102: ...r using Monitor or not 1 Click Update button to save the setting System Record VOSS12 provides call recording feature The record file saved as WAV file format into built in USB storage However the USB...

Страница 103: ...lly Check to use this feature Auto Delete Limit to limit the Record file storage Disk For example set as 70 then after saving over 70 the system will delete the record file from the oldest file NFS Co...

Страница 104: ...Authorization Failure Threshold Authorization Failure Threshold if a phone is trying SIP register and the trial is over this number then the IP address will be registered to Rejecting IP List automati...

Страница 105: ...lnet WEB SNMP will be rejected to access the system 1 Go to Security ACL menu Figure 9 2 ACL Configuration View Frame Accepting IP List IP address list which is permitted to access VOSS12 If any IP ad...

Страница 106: ...S W Upgrade Maintenance Reload This menu is system reload Demon only not restarting VOSS12 1 Go to Maintenance Reload menu Figure 10 1 Reload View Frame 2 Click Reload on right bottom of the above vie...

Страница 107: ...of the above view frame then the following message will be popped up Figure 10 4 Reboot Confirm Message 3 Click Yes to reboot the system Maintenance Factory Default VOSS12 can be conveniently returne...

Страница 108: ...address is set as static IP address then check this menu to return the system s setting up to factory default excluding WAN s IP address 2 Click Factory Default button on the above view frame then th...

Страница 109: ...nce Backup Restore menu Figure 10 7 Backup Restore View Frame Backup Files Backup file list To download the file click the file name Backup Restore Save Direction Check either Backup or Restore FTP Tr...

Страница 110: ...n to fine a backup file and click Restore button then the following message will be popped up Then click Yes button to restore the system Figure 10 10 Backup Restore Message Maintenance S W Upgrade Th...

Страница 111: ...bottom the system will restore the S W to previous version and restart the system Maintenance Phone Profile VOSS12 provides Auto Provision feature to upgrade registered IP Phone s Firmware upgrade via...

Страница 112: ...10 Maintenance 110 AdminGuide Voss12 1 docx be easily added by following setting 1 Go to Maintenance Phone Profile menu Figure 10 13 Phone Profile View Frame 2 Click Add button on the above view frame...

Страница 113: ...de Voss12 1 docx 111 Figure 10 14 Adding Phone Profile View Frame 3 Set up above profile according to IP Phone manual Profile Config Profile Name Input a new profile name Profile Description Input the...

Страница 114: ...cific number Reject Plan input a plan to reject incoming call Audio Option Advanced SIP SIP Session Timer Max Time maximum time to check the SIP session Min Time minimum time to check the SIP session...

Страница 115: ...Figure 10 16 Adding IPPhone S W View Frame Phone Config Model Name Input IP Phone model name S W Version Input S W Version eg if S W version is IP250 S 1 30 180 then input 030 180 H W Code Input IP Ph...

Страница 116: ...0 Maintenance 114 AdminGuide Voss12 1 docx S W File Name Upload the S W file for the IP Phone model 3 Click Save button to save the setting If the phone is set as default then no need to input H W cod...

Страница 117: ...use fire or strange noise under hazardous conditions But sometimes those problems are caused by very tiny part problem or are showing that problem can be a sign of more serious problem Thus please con...

Страница 118: ...es to cool down the device and then open it Power Cord and Adaptor Use the power adaptor and power cord that are provided for the device by the system manufacturer only Do not use different manufactur...

Страница 119: ...n order to optimize the system capacity please follow the instructions below Before connect the power the system should be fully assembled Dust on the system should be removed regularly The Vents and...

Страница 120: ...s12 1 docx Never Install telephone line jacks in wet locations unless the jack is specifically designed for wet location Be careful while installing telephone line or maintaining the line Use No 26 AW...

Страница 121: ...Char Description Example Example Description A group it is recognized as a unit 01 0 1 6 Either 010 011 or 016 Extracting meta character Extracting meta character means that extract meta character wh...

Страница 122: ...nd Number alnum a zA Z0 9 alpha Alphabet alpha a zA z digit Number digit 0 9 Dialplan Example Figure C 1 Dialplan Example Condition For international call using 00700 instead of using 001 Pattern 001...

Страница 123: ...00 has to transfer the call with B 200 to C 300 Then do Hook Flash on A 100 s phone to hold the call with B 200 and dial 300 on phone A then C 300 will be ringing Once C 300 picks up the phone C 300 a...

Страница 124: ...e picked up on B 200 by pressing on B 200 This Pickup Group can be set on Basic Group Adding Pickup group Member Intercom Direct Intercom If A 100 wants to call B 200 through Intercom press 69200 on A...

Страница 125: ...ence Call Conference call is a feature that a lot of people can talk at the same time To fine this feature extension go to Advance Conference The default setting shows this conference all as Ext 500 S...

Страница 126: ...party know the call is not disconnected DHCP Dynamic Host Configuration Protocol DHCP is a protocol used by networked devices to obtain various parameters necessary for the clients to operate in an i...

Страница 127: ...used to signal a loop closure at the FSX s end of the circuit Analog telephone handsets fax machines and modems are FOX devices FXS Foreign eXchange Station Subscriber FXS is a telephone interface de...

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