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  DV-201DM for H.323 & SIP 

Only 

root

 and 

manager

 can access this web page. 

 
You should enter Primary Gatekeeper IP Address, Secondary Gatekeeper IP 
Address and H323 ID    provided by Internet Telephony Service Provider. 
 

Primary G/K IP address 

: It is the first G/K IP address 

 

Secondary G/K IP address 

: It is the second G/K IP address. It is for redundancy 

                                                     

 

H.323 ID 

: G/W is authenticated from G/K with this ID. 

 

Area Access Code

 : Area access code is automatically inserted before the dialed 

digits when you place local calls. 
 

Phone Number 1

 : The telephone number assigned to FXS port 1. 

 

Virtual Calling Number 1

 : The CID assigned to FXS port 1. 

Phone Number 2, Virtual Calling Number 2 :    applicable to the DV-102 only. 
 

PSTN Access Code

 : You can place the outgoing calls over the PSTN by dialing 

PSTN access code first. 
 

PSTN Ring Handling when Busy

 : The incoming PSTN call is ignored or 

generates beep when the FXS port is used for a outgoing call. 
 

Router Link Check   

: This option decide whether check link to default router or 

not. 
 

Using Digit Map 

: This option decide whether use digit map or not. It is only used 

in Korea. To use other area and country, it have to be modified properly. 
 

Phone Volume 

: Voice signal level from FXS to telephone can be changed. The 

default value is 0, and can be set from –5 to +5. 
 

Using VoIP Call Indication Tone

:    This option let customer distinguish VoIP call 

from PSTN call. If you select “Yes”, when you call via internet, you will hear high 
pitch sound when dialing 

 

VoIP Call Listen Port 

:

 

VoIP Call Listen port number can be changed. The default 

value is 1720. 
 

FAX

 : Whether FXS port is used for fax or not 

 

2 - 26 

 

 

Summary of Contents for DV-201DM

Page 1: ...D RZEDV 201DM DATE MARCH 26 2004 HYUNDAI CALIBRATION CERTIFICATION TECHNOLOGIES CO LTD SAN 136 1 AMI RI BUBAL EUP ICHEON SI KYOUNKI DO 467 701 KOREA TEL 82 31 639 8518 FAX 82 31 639 8525 www hctec co kr ATTACHMENT E USER S MANUAL ...

Page 2: ...Access Gateway DV 201DM for H 323 SIP Internet Telephony Gateway System User Guide ...

Page 3: ...Access Gateway DV 201DM for H 323 SIP Internet Telephony Gateway System User Guide ...

Page 4: ......

Page 5: ...DV 201DM Ch 1 System Overview 1 1 ...

Page 6: ...DV 201DM for H 323 SIP 1 2 ...

Page 7: ... 3 4 DTMF Call Progress Tone Detection Generation Function 9 3 5 Voice Compression Decompression Function 9 3 6 VoIP Function 10 3 7 TCP UDP IP Protocol Processing Function 10 3 8 Ethernet Control Function 10 3 9 FAX Relay Function 10 3 10 Console Command I O Function 10 3 11 Telnet Remote Control Function 10 3 12 Diagnostic Function 11 3 13 DHCP Function 11 3 14 WEB based Management Function 11 3...

Page 8: ...DV 201DM for H 323 SIP This page is empty 1 4 ...

Page 9: ...pport for industry standard H 323 SIP Clients Microsoft NetMeeting Analog FXS Interface Supports PSTN back up in case emergency Supports Multiple standard voice CODEC algorithms including G 729 A G 723 1 Supports standard Internet protocols including TCP IP UDP and RTP RTCP Supports static IP and dynamic IP Supports real time Fax Fax Relay G 168 compliant echo cancellation Voice Activity Detection...

Page 10: ... Supports command line interface through ASCII terminal Supports command line interface through telnet client Supports system management interface through Web browser 1 4 Service Configuration Internet Telephony service network is configured as below 1 6 ...

Page 11: ...ol Internet SIP H 323 PPP DHCP NAT Voice Capability G 729A G 723 1 Echo Cancellation G 165 VAD CNG FAX Capability G3 FAX Relay T 38 Power External Adaptor Input 110 220VAC Output 5VDC Note 1 MODEM and Backup Line is the same interface 2 2 Hardware Handling The H W is designed for easy maintenance and repair The H W meets minimum requirements against electrical shock or accidental impact 1 7 ...

Page 12: ...0 60Hz Voltage Fluctuating Range 10 2 4 Environmental Conditions Item Requirements Temperature Normal Optimal Minimal 5 40 18 26 2 50 Humidity Normal Optimal Minimal 20 65 45 55 20 80 Note Minimal environment conditions may not exceed three consecutive days or 15 total days per year 1 8 ...

Page 13: ... a unique function compared to other devices The device automatically switches over to PSTN backup line when Power failure Device Malfunction 3 4 DTMF Call Progress Tone Detection Generation Function DTMF Call Progress Tone Detection and Tone Generation Function detect and generate inband tone transmitted over an analog line 3 5 Voice Compression Decompression Function Voice Compression is the pac...

Page 14: ...FC768 and IP Protocol with RFC791 3 8 Ethernet Control Function Ethernet Control Function is to process MAC Ethernet protocol or IEEE 802 3 Protocol and perform ARP for TCP IP communications with CSMA CD data network 3 9 FAX Relay Function FAX Relay Function is to send Facsimile Data instead of voice data through packetized network so that FAX data may be packetized and terminated via internet 3 1...

Page 15: ...needed to set DV 201DM configuration parameters remotely through web browser Operator is permitted to access DV 201DM to change configuration parameters through web browser or through HTTP protocol 3 15 Operation Authentication Function Operation authentication function is needed to authenticate an operator by prompting the user ID and password when the operator access DV 201DM 3 16 Configuration ...

Page 16: ... is downloaded to the system automatically and automatically installed 3 19 TFTP FTP Processing Function TFTP processing function is for remote maintenance and performs functions defined in RFC1350 FTP processing function is for remote maintenance and performs the functions defined in RFC1986 1 12 ...

Page 17: ...DV 201DM Ch 2 Installation and Maintenance 2 1 ...

Page 18: ...DV 201DM for H 323 SIP 2 2 ...

Page 19: ...17 2 2 1 Logging in to the Web Manager 17 2 2 1 Using the DV 201DM Web browser 19 2 3 Accessing the system with TELNET 35 2 3 1 Basic Commands 35 2 3 2 IP Configuration 36 2 3 3 Modem Configuration 38 2 3 4 Routing Table Configuration 42 2 3 5 Address Configuration Commands 44 2 3 6 VoIP Configuration Commands H 323 45 2 3 7 VoIP Configuration Commands SIP 48 2 4 Configuring system with connected ...

Page 20: ...DV 201DM for H 323 SIP This page is empty 2 4 ...

Page 21: ...nance is to be performed only by qualified personnel 2 To avoid the risk electrical shock while installing H W you must remove the power cord socket from the power connector on the back of DV 201DM 3 Put on a wristlet for preventing static electricity 4 Do not use any other power adaptor then the one provided with the DV 201DM 5 Maintain between 0 and 40 and it must be well ventilated 6 When remov...

Page 22: ...ure 1 DV 201DM Cable connection 1 3 2 Connecting Ethernet cable The Straight cable is also used to connect LAN port to a terminal like workstation PC or notebook When connecting LAN port to HUB Cross over cables must be used Maximum length of RJ 45 should be less than 85m Figure 2 RJ 45 cable UTP cable 2 6 ...

Page 23: ...X 4 NC 4 NC 5 NC 5 NC 6 RX 6 RX 7 NC 7 NC 8 NC 8 NC Table 1 Connection between WAN port and modem 1 3 3 FXS port FXS port is for telephone or FAX connection using RJ 11 connector to the terminal RJ 11 Plug Analog phone Fax RJ 11 Plug FXS port Pin Signal Connect Pin Signal 1 NC 1 NC 2 NC 2 NC 3 Ring 3 Ring 4 Tip 4 Tip 5 NC 5 NC 6 NC 6 NC Table 2 FXS port cable pin connection 2 7 ...

Page 24: ...d to DV 201DM must comply with the following 1 Ethernet Maximum length of 10 100BaseT Ethernet is 330 feets 100 meters complies with IEEE802 3 Recommendation 2 Analog line Maximum length of analog line is defined by loop resistance Maximum loop resistance is up to 600Ω included telephone voice switch 1 3 6 LED Status When DV 201DM comes up you can judge the operation status of system by LED status...

Page 25: ...G K or CA Registered Registering LAN LAN cable is Connected LAN cable is Not connected TEL OFF HOOK ON HOOK VOIP Calling via internet No call via internet PSTN Calling via PSTN No call via PSTN 2 9 ...

Page 26: ...68 1 253 In next paragragh we describe how to configure dynamic IP when DHCP server function is activated In 2 1 1 paragragh we describe how to configure static IP according to user s network environment 2 1 1 Configuring Dynamic IP DV 201DM supports DHCP server function to assign private IP to PC Our software enables users to use DV 201DM in a Dynamic Network environment 1 Open Control Panel and ...

Page 27: ...2 Double click Local area connection in network connection window 3 Click on Properties button 2 11 ...

Page 28: ...DV 201DM for H 323 SIP 4 Select Internet protocol TCP IP and click on Properties button 2 12 ...

Page 29: ...5 Select IP address automatically and DNS address automatically in internet protocol attribute window 2 13 ...

Page 30: ...ask and default gateway value Verify IP address range is between 192 168 1 10 192 168 1 29 Remember the IP Address value should be in 192 168 1 1 192 168 1 253 subnet mask should be 255 255 255 0 and Default Gateway should be 192 168 1 254 c ipconfig Windows IP Configuration Ethernet adapter local area connection Connection specific DNS Suffix IP Address 192 168 1 10 Subnet Mask 255 255 255 0 Defa...

Page 31: ...low 1 Choose Use the following IP address enter IP address subnet mask Default gateway If static IP is configured in DV 201DM also enter DNS server information IP address any address of 192 168 1 1 through 192 168 1 253 Subnet mask 255 255 255 0 Default gateway 192 168 1 254 Note When DV 201DM is allocated IP by DHCP protocol input the value and confirm DNS server address 2 Click OK button and clo...

Page 32: ... 192 168 1 254 Pinging 192 168 1 254 with 32 bytes of data Reply from 192 168 1 254 bytes 32 time 3ms TTL 255 Reply from 192 168 1 254 bytes 32 time 3ms TTL 255 Reply from 192 168 1 254 bytes 32 time 2ms TTL 255 Reply from 192 168 1 254 bytes 32 time 1ms TTL 255 Ping statistics for 192 168 1 254 Packets Sent 4 Received 4 Lost 0 0 loss Approximate round trip times in milli seconds Minimum 1ms Maxim...

Page 33: ...fy that the DV 201DM LEDs are blinking This indicates that the DV 201DM is ready to be configured 1 Open a new Web browser window and enter the DV 201DM s IP address 192 168 1 254 8000 and press Enter 2 Enter your user name and password The default user name is root and the default password is admin 2 17 ...

Page 34: ...DV 201DM for H 323 SIP 3 When the DV 201DM Web Manager Opening page is displayed You are logged in 2 18 ...

Page 35: ...n the left column For example click the System Information Admin Password link to access the System Information and Change Password page 1 System Information and Change Password The Change Password page shows the DV 201DMs name current software version and MAC address You can also change the user s password from this page 2 19 ...

Page 36: ... PPP Configuration Any of parameters on the PPP Configuration page can be modified by simply entering the desired values into the respective boxes Dialing Number ISP s Phone Number User Name User ID given by ISP Password Password of the user ID Connection Type By default it is Always On Always On In this mode the user is always connected to the ISP 2 20 ...

Page 37: ...imer When the connection type is always on and the connection to the ISP is disconnected After Retry connection timer value the system will try to connect the ISP automatically The Retry connection timer value should be at least 15 seconds You can choose the number 15 to 30 Country Name The name of your country if your country name is not there you can select similar country Dial Mode The analog t...

Page 38: ...DV 201DM for H 323 SIP 3 Speed Dial Click the Speed Dial link to access the Speed Dial Configuration page illustrated below Frequently dialed phone numbers can be stored for Speed Dialing 2 22 ...

Page 39: ...tus This page is refreshed for every 20 seconds period Network port IP Shows the WAN port IP address allocated by ISP PC Port IP Shows the LAN port IP set by the user VOIP Status Shows the registration state to proxy server or Gatekeeper PPP Status Shows the Modem connection status and PPP status Modem Connection Speed Shows the current modem connection speed 2 23 ...

Page 40: ...ocess of dialing and connecting PPP This page will be refreshed automatically for every 20 seconds period 5 IP Configuration Click the IP Setting link to access the IP Configuration page illustrated below Only root and manager can access this web page This page displays the current LAN IP Address and LAN mode Any of parameters on the IP Configuration page can be modified by simply 2 24 ...

Page 41: ...P In One IP mode the NAT Is enabled and One IP is on In NAT Enable mode the NAT is enabled and One IP is off In NAT Disable mode the NAT IS disabled and One IP is off 6 VoIP Setting Click the VoIP Setting link to access the Port Configuration page illustrated below H 323 setting 2 25 ...

Page 42: ... Access Code You can place the outgoing calls over the PSTN by dialing PSTN access code first PSTN Ring Handling when Busy The incoming PSTN call is ignored or generates beep when the FXS port is used for a outgoing call Router Link Check This option decide whether check link to default router or not Using Digit Map This option decide whether use digit map or not It is only used in Korea To use ot...

Page 43: ...ified URL VoIP Server Name Proxy Server name or IP address Service Domain Name Domain Name VoIP User ID VoIP User Password VoIP Password Confirm DV 201DM is authenticated by proxy server with this ID and password Phone Number 1 The telephone number assigned to FXS port 1 Area Code You may insert a access code for security Ex By inputting 15 into this box you must dial 15 before dialing outbound on...

Page 44: ... port is used for a outgoing call Using VoIP Call Indication Tone This option let customer distinguish VoIP call from PSTN call If you select Yes when you call via Internet you will hear high pitch sound when dialing Router Link Check This option decide whether check link to default router Using Digit Map Only used in Asia Caller ID Transmission decides whether calling party number is sent or not ...

Page 45: ... illustrated below Only root and manager can access this web page When using for DHCP Server setting the starting IP address and the number of DHCP clients needs to be configured Allocated IP Addresses When there are multiple users this page shows the how IP addresses are matched with each users MAC address 2 29 ...

Page 46: ...rt Forwarding link to access the Ports Configuration page illustrated below Only root and manager can access this web page When the DV 201DM is used with the NAT server all the packets from the specific UDP TCP ports are forwarded to the specified IP addresses 2 30 ...

Page 47: ... to access the Restart System page illustrated below Only root and manager can access this web page To restart the system click the Restart button You need to restart the system to apply the modified system parameters to the system 2 31 ...

Page 48: ...ages Manual upgrade is only recommended for Command Prompt users 1 Enable S W Manual Upgrading option in System Software Upgrade page and press Apply button 2 Download the files needed for upgrade from the Upgrade FTP server to a client PC 3 Open Command Prompt from Start Menu under Accessories or from Run and type cmd followed by Enter 4 Move to the directory containing the downloaded files 5 Per...

Page 49: ...ct Used enter the IP address of CDS server and click Apply button By using the CDS server you can control the configuration data of all systems remotely via the MAC addresses of each system 11 Firmware Upgrade Click Firmware Upgrade link to access the Firmware Upgrade page illustrated below Only root and manager can access this web page We can upgrade firmware of our product from this web page Do ...

Page 50: ...DV 201DM for H 323 SIP Click Browse button choose binary file ex bin for upgrading in your PC And Click Open button Click OK button and DV201DM will be upgraded 2 34 ...

Page 51: ...t Phone Gateway System Made by Davolink Inc Motorola MPC850 SW Release 1 00 2003 10 1 PM 06 23 26 HW MPU 0 51 1Ch FXS 1Ch FXO Now System Running Login root Password DV_GW 2 3 1 Basic Commands DIR or LS dir is the same command as ls and displays the executable commands and sub directory which can be run in the current directory The sub directory is displayed with added after the last character to d...

Page 52: ...ion directory Same results are displayed in case of typing cd system or in case of typing system or in case of typing s minimized letter of destination directory system If only cd without any character is typed they can see root directory The following example is an after executing cd command on root directory Example DV_GW cd system DV_GW SYSTEM 2 3 2 IP Configuration 1 Command directory DV_GW CO...

Page 53: ... 88 12 92 LAN IP Address 192 168 2 12 LAN Subnet Mask 255 255 255 240 LAN Gateway 0 0 0 0 DNS Parameters DNS Not Used CHANGE This command used for setting NAT mode IP address subnet mask and Ethernet address Details can be seen by executing show at DV_GW CONFIG IP prompt Example DV_GW CONFIG IP change WAN Parameters NAT mode Enable WAN IP Address 0 0 0 0 WAN Subnet Mask 0 0 0 0 WAN Gateway 0 0 0 0...

Page 54: ... 0 0 Ethernet Addr 00 08 52 88 12 92 LAN IP Address 192 168 2 12 LAN Subnet Mask 255 255 255 240 LAN Gateway 0 0 0 0 DNS Parameters DNS Not Used 1 Change NAT mode 2 Change IP Address 3 Change IP Netmask 4 Change Def G W IP 5 Change DNS Server IP 6 Change DNS Domain Name 0 Exit Menu What do you want to change 0 7 0 You must RESET to apply modified value s to system 2 3 3 Modem Configuration 1 Comma...

Page 55: ...etrytimer Command to set Retrytimer SHOW This command display Country name User name Dialing number Connection type Modem speaker Pulsedial idle timer default which are required to perform Modem service Executing show at DV_GW CONFIG MODEM prompt can see details DV_GW CONFIG Modem show MODEM PPP Parameters Country Company 61 KOREA Dialing Number 533 User Name davo Password drc Connection Type Allw...

Page 56: ... off TConfig Writing Done MODEM Speaker Turned OFF DV_GW CONFIG MODEM conntype 1 TConfig Writing Done Connection Type Changed to Dial Up 1 DV_GW CONFIG MODEM country Usage country value Value ITU T T 35 AnnexA 8 bit country code hexadecimal value 00 JAPAN 09 AUSTRALIA 0F BELGIUM 16 BRAZIL 1B BULGARIA 26 CHINA 31 DENMARK 3C FINLAND 3D FRANCE 42 GERMANY 50 HONGKONG 53 INDIA 57 IRELAND 59 ITALY 61 KO...

Page 57: ...y 53 TConfig Writing Done Country Changed to 53 INDIA DV_GW CONFIG MODEM pulse dial off TConfig Writing Done Pulse Dialing Mode Changed to OFF Tone Dialing DV_GW CONFIG MODEM idle timer 0 TConfig Writing Done Idle Timer Changed to 0 sec DV_GW CONFIG MODEM retrytimer 15 TConfig Writing Done Retry Timer Changed to 15 sec 2 41 ...

Page 58: ... call routing Del Command to delete numbers registered in prefix table SHOW This command is used to display numbers registered in prefix table to the console When add command is successfully executed the number is added in the blank space in the following figure Executing show at DV_GW CONFIG ROUTE prompt shows current routing table Example DV_GW CONFIG ROUTE show PREFIX TABLE INTF PORT NUMBERS TR...

Page 59: ...th 20 virtual dial tone pause 500ms trnc the number of truncation 0 31 pre prefix number 0 9 NULL post postfix number 0 9 NULL extra extra informations hexa decimal DV_GW CONFIG ROUTE add fxs 0 3922241 0 Prefix Table Add success DV_GW CONFIG ROUTE add net 0 8 1 127 0 0 1 Prefix Table Add success DEL This command used for deleting number from the routing table Executing del at DV_GW CONFIG ROUTE pr...

Page 60: ...cription Show show registered addresses Myaddr register local addresses SHOW This command is used to display specified port number registered in address table Executing show at DV_GW CONFIG ADDRESS prompt shows current address table Example DV_GW CONFIG ADDRESS show Address TABLE INTF PORT LOCAL ADDR PEER ADDR GROUP PORT FXS 0 7183312 FXS 1 7183313 MYADDR This command is used to register specified...

Page 61: ...CONFIG VOIP 2 Command function This command displays and sets up all the parameters required for the H 323 Details can be seen by typing an appropriate command from the DV_GW CONFIG VOIP prompt to verify it Changes and verifies the parameters needed for H 323 the parameters are as follows Parameter Description G K Interface Mode Connection mode of G K E 164 Address IP address and Port number of th...

Page 62: ...t of the BRQ message NAT Used Use or not of the NAT Discard non fast alert Function of neglecting an ALERT message in a condition that there is no audio information Protocol Parameters Using H 245 start outbound Use or not of the H 245 channel when starting a call RTP Parameters Frame Packet The numbers of frame per one IP packet Manual RAS Config Manual RAS Use or not of a Manual RAS 3 Available ...

Page 63: ...Message Relay using using H245 UII alphanume ric Fast Audio Connect No Force RBT to Network No Wait Alert Timer 20000 msec H 245 Tunneling No BRQ Used No NAT Used No Discard non fast alert No Open H 245 when conneted outbound side No Press any key to continue RTP Parameters Frame Packet 1 CONFIGURE Sets the parameters related to RAS Protocol RTP and Manual RAS requested in H 323 protocol Example D...

Page 64: ... URLMODE Command to set URL mode SIP or TEL for peer UA MYDOMAIN Command to set service domain name MYTELNUM Command to set a telephone number assigned to FXS port 1 PSVNAME Command to set proxy server name RGNAME Command to set registrar name AREACODE Command to set area code CONFAPPLY Command to restart SIP according to newly setting parameters SHOW This command displays the set up value of the ...

Page 65: ...t 5060 Server transport udp Registrar name proxy davolink co kr Registrar port 8001 Registrar trans udp Register timer 3600 sec Payload type G723_63 004 G711U 000 G723_53 102 G711A 008 G729A 018 GSM 003 Encoding name G723_63 G723 63 G711U PCMA G729A G729 G723_53 G723 53 G711A PCMU GSM Codec enabled G711U G711A G723_63 Areacode NONE UserID Password 2 49 ...

Page 66: ...xy Server or Gatekeeper and telephone number and so on z You can configure by using a telephone connected to TEL port and Web browser of your PC Configuration by telephone can be applied if you can not connect to DV 201DM by web browser We recommend using Web browser Using telephone please refer page 2 49 50 z When you have configured system Please inject a PSTN line Make restart DV 201DM by power...

Page 67: ...ver doesn t respond Or script of system is not adapted ISP Network is not connected Because PPP negotiation was failed Æ Remote PPP server has dropped the connection Or some problems with PPP Network is not connected Because connection is dropped by idle timer expiry Æ You have not used a telephone or PC for too long times Following announcements shows current internet connection status and VoIP s...

Page 68: ...t NAT mode 961 Use OneIP mode Allocated IP address of DV 201DM is same as PC 962 Use NAT mode IP address of PC shall be private IP address 9876543210 restart DV 201DM immediately 9876546540 change all configurations to factory setting And restart DV 201DM immediately force to disconnect current PPP connection immediately 2 52 ...

Page 69: ...201DM Setup N AT F OK AT GCI 61 OK ATTX4W1L3M1E0S95 47 OK AT N3B0 OK N Dial N ATD T CONNECT N 2 Operation of sript The script of DV 201DM is divided according to space character and consisted of receiving expectation character column and transmitting character column The script of above box can be divided into each character column and is as the follows The bold character is a receiving expectatio...

Page 70: ...3 d 0 9 Transmitting delay Delay A d2BC c Not included opening character c T Replacement character column with dialing number TEL ATD T U Replacement character column with user ID USER U P Replacement character column with password PASSWORD P N NULL no character column N In DV 201DM expansion character columns are supported The expansion character column is used for comparing receiving expectation...

Page 71: ...ess the menu for modifying setup script DIAL Access the menu for modifying dial script EXP Add remove a character column to from expansion character column EX 1 GW CONFIG MODEM script usage script show setup dial exp add del name expand show show current MODEM scripts setup change script to initialize setup MODEM dial change script to dial to PSTN ISP exp expand reserved script word ex U usr EX 2 ...

Page 72: ... added C GW CONFIG MODEM script show MODEM SCRIPT setup N AT F OK AT GCI 61 OK ATPX4W1L3M1E0S95 47 OK AT N3B0 OK N dial N ATD T CONNECT N U U P P C PPP PPP N C EX 6 GW CONFIG MODEM script exp del C Script Expand deleted C GW CONFIG MODEM script show MODEM SCRIPT setup N AT F OK AT GCI 61 OK ATPX4W1L3M1E0S95 47 OK AT N3B0 OK N dial N ATD T CONNECT N U U P P C PPP PPP N 2 56 ...

Page 73: ...12F 1591 9 Anyang K Center Burim Dong Dongan Gu Anyang City Gyeonggi Do Korea TEL 82 31 387 3240 FAX 82 31 387 3214 Homepage http www davolink co kr ...

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