Dahua Technology VTH2421F Series User Manual Download Page 89

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3.7.6 Adding Device

Background Information

This module differs in

Villa

and

Apartment

mode. This section takes the

Apartment

mode as an

example. The snapshots are for reference only.
You can add VTHs and VTOs.

Procedure

Step 1

On the main screen, select

Setting

Project Setting

Add Device

Step 2

Set a password for the VTH you want to add.

Figure 3-55 Set a password an email address for the VTH

Step 3

Set a password and an email address for the VTO.

The password is used to enter project setting.

Summary of Contents for VTH2421F Series

Page 1: ...Digital VTH 4 6 version User s Manual V1 0 0...

Page 2: ...ple by implementing measures which include but are not limited Providing clear and visible identification to inform people of the existence of the surveillance area and provide required contact inform...

Page 3: ...company names in the manual are properties of their respective owners Please visit our website contact the supplier or customer service if any problems occur while using the device If there is any un...

Page 4: ...vice while the adapter is powered on Strictly comply with the local electric safety code and standards Make sure the ambient voltage is stable and meets the power supply requirements of the device Do...

Page 5: ...22G Series 8 1 2 4 VTH5221D Series 9 1 2 5 VTH5241D Series 10 1 2 6 VTH5421E Series 11 1 2 7 VTH5421H Series 12 1 2 8 VTH8621K Series 13 1 3 Alarm Port 13 1 4 Function 14 2 Quick Configuration of VTO...

Page 6: ...ion 45 3 3 1 Security Alarm 45 3 3 2 Guest Message 47 3 3 3 Publish Information 47 3 3 4 Video Pictures 47 3 4 Monitor 48 3 4 1 Monitoring VTO 48 3 4 2 Monitoring IPC 50 3 4 2 1 Adding IPC 50 3 4 2 2...

Page 7: ...nformation 75 3 7 Project Settings 76 3 7 1 Forget Password 76 3 7 2 Network Settings 77 3 7 3 Configuring VTH 78 3 7 4 VTO Configuration 79 3 7 5 Factory Reset 80 3 7 6 Adding Device 81 3 7 7 Reset M...

Page 8: ...dding VTH to DMSS 106 5 4 Configuring Arm and Disarm 108 5 5 DMSS Calling VTH 109 5 6 DMSS Calling VTO 110 5 7 DMSS Unlocking Door 111 5 8 DMSS Monitoring VTO 112 5 9 Viewing Alarm Information 114 5 1...

Page 9: ...1 Product Overview The following front and rear panel figures are for reference only 1 1 Front Panel 1 1 1 VTH2421F Series Figure 1 1 Front panel 1 1 2 VTH2621G VTH2622G Series Figure 1 2 Front panel...

Page 10: ...to hang up During monitoring press to speak to unit VTO villa VTO fence station and verifying VTO During speaking press to exit speaking Menu Go to main menu Monitor In standby mode press to monitor...

Page 11: ...to hang up During monitoring press to speak to unit VTO villa VTO fence station and verifying VTO During speaking press to exit speaking Menu Go to main menu Monitor In standby mode press to monitor...

Page 12: ...4 1 1 5 VTH5421E Series Figure 1 5 Front panel 1 1 6 VTH5421H Series Figure 1 6 Front panel...

Page 13: ...5 1 1 7 VTH8621K Series Figure 1 7 Front panel...

Page 14: ...r panel may differ depending on the actual product For details about the alarm port see 1 3 Alarm Port 1 2 1 VTH2421F Series Figure 1 8 Rear panel Table 1 3 Rear panel description No Port 1 Alarm port...

Page 15: ...7 1 2 2 VTH2621G Series Figure 1 9 Rear panel non 2 wire Table 1 4 Rear panel description No Port 1 Alarm port 2 Power input port 3 Network port...

Page 16: ...8 1 2 3 VTH2622G Series Figure 1 10 Rear panel 2 wire Table 1 5 Rear panel description No Port 1 Alarm port 2 2 wire port 3 Network port...

Page 17: ...9 1 2 4 VTH5221D Series Figure 1 11 Rear panel Table 1 6 Rear panel description No Port 1 Reset key 2 Network port 3 RS 485 extended port 4 Alarm port 5 SD card slot Figure 1 12 RS 485 extended port...

Page 18: ...10 1 2 5 VTH5241D Series Figure 1 13 Rear panel Table 1 7 Rear panel description No Port 1 Network port 2 RS 485 extended port Figure 1 14 RS 485 extended port...

Page 19: ...11 1 2 6 VTH5421E Series Figure 1 15 Rear panel Table 1 8 Rear panel description No Port 1 RS 485 extended port 2 Power port 3 Network port 4 Alarm port Figure 1 16 RS 485 extended port...

Page 20: ...12 1 2 7 VTH5421H Series Figure 1 17 Rear panel Table 1 9 Rear panel description No Port 1 Alarm port 2 RS 485 and power output port 3 Power input port 4 Network port Figure 1 18 RS 485 port...

Page 21: ...1 2 8 VTH8621K Series Figure 1 19 Rear panel Table 1 10 Rear panel description No Port 1 Alarm port 2 RS 485 and power output port 3 Power input port 4 Network port 1 3 Alarm Port Figure 1 20 Alarm Po...

Page 22: ...nter Auto Snapshot Take snapshots when calling or monitoring and store them in the SD card DND Do Not Disturb Mute all message and call notifications Remote Unlock Unlock doors remotely Arm and Disarm...

Page 23: ...he device must be used with a VTO that is the SIP server This section takes a unit VTO as an example See corresponding user s manuals for other VTO types Log in to the web interface of every VTO and V...

Page 24: ...Next This password is used to log in to the web interface It must be at least 8 characters and include a combination of at least two types among number letter and symbol Figure 2 2 Set an email addres...

Page 25: ...to the login web page Figure 2 4 Login web page Step 7 Enter username admin by default and password and then click Login 2 2 2 Network Parameters Background Information Change the IP address of the V...

Page 26: ...devices Procedure Step 1 Select Network SIP Server Figure 2 6 SIP server 1 Step 2 Select a server type When this VTO or another VTO works as the SIP server select Server Type to VTO It applies to a sc...

Page 27: ...ks as the SIP server Select Server Type as DSS Express DSS Pro Pro and configure the parameters and then click OK The VTO automatically restarts and it jumps to the login web page VTO settings have be...

Page 28: ...re Step 1 Log in to the web page of the VTO Step 2 Select Household Setting VTO No Management Figure 2 8 VTO number management Step 3 Click Add Figure 2 9 Add a VTO Step 4 Configure the parameters Tab...

Page 29: ...Step 6 Repeat Step3 Step5 to add other VTOs 2 2 6 Adding VTH Background Information Add VTHs only when the current VTO works as the SIP server Add both main and extension VTHs Procedure Step 1 Select...

Page 30: ...on VTH number must end with 1 2 and 3 For example if the main VTH is 101 0 extension VTHs must be 101 1 101 2 Register Password Keep it default Register Type Step 4 Click OK Step 5 Repeat Step2 to Ste...

Page 31: ...ure 2 12 Select a region and language Step 2 Select Apartment or Villa and then tap OK This section takes Villa as an example Figure 2 13 Select apartment or villa Step 3 Select First time Config and...

Page 32: ...24 Figure 2 14 First time configuration Step 4 DHCP is selected by default or select Static IP and configure the parameters as needed Figure 2 15 DHCP...

Page 33: ...tap Next The password is used to enter project setting If you select Apartment in Step 2 initialization is completed with this step Figure 2 17 Set a password an email address for the VTH Step 6 Set a...

Page 34: ...address for the VTO Step 7 Click Initialize to initialize a single device or Batch Initialization to initialize all available devices and then click Next Figure 2 19 Initialize devices Step 8 Click O...

Page 35: ...27 Figure 2 20 Network configuration Result Different models have different main screens Here are the two kind of main screens Figure 2 21 Main screen 1...

Page 36: ...pport WLAN function Use a router with secured encryption protocols WLAN 1 On the main screen select Setting WLAN 2 Tap WLAN screen and tap next Wi Fi Name to see all of the available Wi Fi services Fi...

Page 37: ...IP and enter Local IP Subnet Mask and Gateway and then tap OK Figure 2 25 Wireless IP You can also tap Wireless IP and turn on DHCP to obtain the information automatically 2 3 2 2 LAN Procedure Step...

Page 38: ...cally Figure 2 26 Configuring LAN 2 3 3 Configuring VTH Procedure Step 1 On the main screen select Setting Project Setting Step 2 Enter password and tap OK Step 3 Tap VTH Config Figure 2 27 VTH config...

Page 39: ...TH PWD are the username and password of main VTH Default user name is admin and the password is the one set during initialization Step 5 Turn on the following functions as needed SSH The debugging ter...

Page 40: ...r Username Keep it default or turn on Custom Name and then you can edit the username Registration PWD Keep it default Domain Name When a VTO works as the SIP server it must be VDP otherwise it can be...

Page 41: ...the web interface login username and password of the VTO Add sub VTO or fence station 1 Enter the sub VTO or fence Station name IP address username and password 2 Turn on Enable Status Tap to turn pag...

Page 42: ...ace 2 4 2 VTH Monitoring VTO VTH can monitor VTO fence station or IPC This section takes monitoring VTO as an example On the main screen of the VTH select Monitor Door and then tap a VTO to enter moni...

Page 43: ...35 Figure 2 32 Monitoring image SD card is needed for recording and snapshot otherwise the icons will be gray...

Page 44: ...es not have an SD card and the video audio message uploading function is enabled on the VTO three tabs will be displayed Guest MSG Guest Snap and Guest Video You can view delete and clear the messages...

Page 45: ...Management Center 8 Arm disarm Display unread alarm information Tap to select an arm mode from Sleep Away Home and Custom 9 Do not disturb Enable to not receive any call or message 10 Screen Off Tap...

Page 46: ...to not receive any call or message 6 Setting Tap to enter system setting Tap the icon and then select Project Setting Enter the password you set during initialization and then go to the project setti...

Page 47: ...l record to call back Delete Tap Edit and then tap Delete to delete a record Clear Clear all record in the current tab All or Missed Call If storage is full the oldest records will be overwritten Back...

Page 48: ...e 3 5 User information 1 Tap Add 2 Enter the information 3 Tap OK Related Operations Edit user information Tap a user and tap Edit Delete a user Tap Edit select a user and then tap Delete You can sele...

Page 49: ...user Step 2 Enter the room number VTH room number If VTO works as SIP server dial room number directly If the platform works as SIP server Call a user in the same unit and the same building dial room...

Page 50: ...Call in progress 3 2 3 2 From Contact Procedure Step 1 Select Call Contact Step 2 Select the one you want to call Step 3 Tap to start 3 2 4 Call from User When receiving calls from other VTHs the foll...

Page 51: ...43 Figure 3 9 Call screen 1 Answer Hang up Figure 3 10 Call screen 2 3 2 5 Call from VTO Procedure Step 1 Dial VTH room number such as 9901 at VTO to call VTH Step 2 On the VTH screen tap Answer...

Page 52: ...this channel is not available Tap to talk to the VTO Select an IPC in Favorite to monitor Take snapshot This key will be gray if SD card is not inserted Take recording Complete recording when the cal...

Page 53: ...one in Guest Message and Video Pictures is stored in the SD card which means you need an SD card for these two functions Only certain models support SD card If the storage in the Device or SD card is...

Page 54: ...46 Figure 3 13 Message Select Info Security Alarm and then you can view and manage all alarm records Figure 3 14 Security alarm...

Page 55: ...nage all messages Figure 3 15 Guest message 3 3 3 Publish Information Select Info Publish Info and then you can view and manage all messages Figure 3 16 Publish information 3 3 4 Video Pictures Select...

Page 56: ...or IPC on the VTH 3 4 1 Monitoring VTO Background Information When adding VTOs make sure that the username and password of each device is consistent with the web login username and password Otherwise...

Page 57: ...Select an IPC and when this VTO or fence station calls you will see the monitoring image from this IPC Display the serial number of the VTO or fence station in QR code Scan the QR code in the app to a...

Page 58: ...If the SD card is full the oldest videos will be overwritten An SD card is needed to use this function If the VTH is connected to multiple VTOs IPCs tap and to switch device Exit monitoring Tap to spe...

Page 59: ...21 Add IPC Step 3 Configure the parameters Table 3 6 Parameter description Parameter Description IPC Select IPC or NVR IPC32 Name Name of the IPC NVR IP IP address of the IPC NVR User Name The login...

Page 60: ...connected default setting is 1 If NVR is connected set channel number of IPC on NVR Step 4 Tap OK 3 4 2 2 Modifying IPC Procedure Step 1 Select Monitor IPC Step 2 Tap of IPC Step 3 Modify IPC paramete...

Page 61: ...kground Information Displays VTO fence stations or IPC that have been added to favorites To view favorite list please ensure that VTO fence station or IPC have been added to favorites Otherwise the li...

Page 62: ...rings There is an SD card on the VTH and users can import ring tones to the SD card Ring tones must be stored in the Ring folder at the root directory of the SD card Audio files must be pcm files aud...

Page 63: ...box to select rings and tap and to adjust the volume 3 6 1 2 VTH Ring Background Information Set the ring for this VTH Procedure Step 1 Tap Setting Step 2 Select Ring VTH Ring Figure 3 25 VTH ring se...

Page 64: ...3 26 Alarm ring Step 3 Tap text box to select rings and tap and to set the volume 3 6 1 4 Other Ring Settings Background Information Set VTO ring time VTH ring time MIC volume talk volume and ring mut...

Page 65: ...p to enable Ring Mute and the icon becomes VTO ring time ring time when a VTO calls this VTH VTH ring time ring time when another VTH calls this VTH 3 6 2 Card Information Background Information Issue...

Page 66: ...n by selecting Lock 1 and Lock 2 as needed Step 4 Click Confirm Click Delete to delete the card information 3 6 3 Alarm Setting Set wire zone wireless zone and alarm output Zones can be set under disa...

Page 67: ...larm Bypass Alarm will not be triggered in the area After disarmed this area will restore to normal working status Remove The area is invalid during arm disarm 24 Hour Alarm will be triggered all the...

Page 68: ...tus at the end of Exist Delay If multiple areas set the exit delay interface prompt will conform to maximum delay time 3 6 3 2 Wireless Zone Background Information Only devices with wireless function...

Page 69: ...enabling alarm output when other devices call this VTH the alarm output device will output alarm information Procedure Step 1 Tap Setting Step 2 Select Alarm Output Figure 3 31 Output Step 3 Tap to en...

Page 70: ...eds Step 3 Turn on or turn off the area you selected to enable or disable the arm mode Multiple areas can be added into one arm mode simultaneously whereas one area can be added into different modes F...

Page 71: ...imultaneously whereas one area can be added into different modes Figure 3 33 Mode setting WirelessArea 3 6 5 Forward Setting Background Information Forward incoming calls Parameters at this interface...

Page 72: ...will be deemed as busy forwarding No Answer If no one answers after VTH ring time the incoming call will be forwarded to preset number Set VTH ring time at Setting Ring Other screen To forward to a us...

Page 73: ...the NTP server automatically turn it off to set time or time zone manually Enable DND period set start and end time or tap Click to select week to select the day s and you will not receive any call o...

Page 74: ...ap the icon and then the screen will be locked for 30 seconds During the period clean the screen It restores after 10 seconds 3 6 6 3 QR Code Background Information Download the app on your smart phon...

Page 75: ...67 Figure 3 37 DMSS onscreen prompt Figure 3 38 QR Code without DMSS QR code...

Page 76: ...Register QR code on the left to register the VTH to the DSS Agile VDP For detailed operation of this step see 4 2 Registration and Login 3 6 6 4 Other Settings Background Information Set monitor time...

Page 77: ...nd does not answer the VTO it will enter message status according to prompt and save the message in the SD card If VTH does not have SD card and the leave message upload function is not enabled on the...

Page 78: ...r and Delete Snapshots will be displayed which when turned on snapshots will be deleted if the VTH answers the call Touch Sound After enabling touch sound there will be a ring when touching the screen...

Page 79: ...and enter Local IP Subnet Mask and Gateway and then tap OK Figure 3 43 Wireless IP You can also tap Wireless IP and turn on DHCP to obtain the information automatically 3 6 8 User Password Setting Th...

Page 80: ...OK to save the configuration 3 6 9 Network Password Setting The network password is used when adding the VTH to the DMSS app 3 6 9 1 Creating Network Password The network password is used to add the V...

Page 81: ...there will be onscreen prompt appeared Figure 3 46 Weak password prompt Step 4 Tap OK Result The VTH would automatically generate a QR code that contains the User account When you scan the DMSS QR co...

Page 82: ...Figure 3 47 DMSS QR Code 3 6 9 2 Changing Network Password This section applies to the situation when you know your current network password and you want to change it to another one Procedure Step 1...

Page 83: ...n select Setting Password Network PWD Step 2 Tap Forget PWD and enter the new password in the Password Verification window and then tap OK Figure 3 49 Password verification 3 6 10 Product Information...

Page 84: ...7 Project Settings 3 7 1 Forget Password Background Information If you forget initialization password when entering project settings interface reset password through Forget Password on the screen Proc...

Page 85: ...Tap Next Step 5 Enter the password and confirm it and then enter the obtained security code Step 6 Tap OK to complete resetting the password 3 7 2 Network Settings Procedure Step 1 On the main screen...

Page 86: ...1 On the main screen select Setting Project Setting Step 2 Enter password and tap OK Step 3 Tap VTH Config Figure 3 53 VTH configuration Step 4 Configure VTH information As a main VTH Enter the room...

Page 87: ...re the username and password of main VTH Default user name is admin and the password is the one set during initialization Step 5 Turn on the following functions as needed SSH The debugging terminal wi...

Page 88: ...sub VTO or fence Station name IP address username and password 2 Turn on Enable Status Tap to turn page and add more sub VTO or fence stations 3 7 5 Factory Reset Background Information All parameters...

Page 89: ...he snapshots are for reference only You can add VTHs and VTOs Procedure Step 1 On the main screen select Setting Project Setting Add Device Step 2 Set a password for the VTH you want to add Figure 3 5...

Page 90: ...il address for the VTO Step 4 Tap Initialize to initialize a single device or Batch Initialization to initialize all available devices and then click Next Figure 3 57 Initialize devices Step 5 Tap One...

Page 91: ...ocedure Step 1 Select Setting Project Setting Step 2 Enter the password you set during initialization and tap OK Step 3 Tap Reset MSG Figure 3 59 Reset MSG Step 4 Enter a new email address turn on Res...

Page 92: ...that the area has been added into arm mode Otherwise there will be no alarm triggering after arm Please ensure that it is in disarmed status Otherwise arm will fail Procedure Step 1 Tap on the home sc...

Page 93: ...m and disarm is 123456 If you want to modify the password please refer to 3 6 8 User Password Setting for details If delay alarm is set in the area the device will beep continuously at the end of exit...

Page 94: ...3 6 8 User Password Setting for details If you are forced to enter disarm password in case of emergencies enter anti hijacking password which is the reversed arm password The system will disarm and a...

Page 95: ...ading the App Background Information Before you start make sure the VTO VTH and DSS server are properly connected Procedure Step 1 On the VTH main screen tap Setting Step 2 Enter the password you conf...

Page 96: ...ration interface Step 2 Tap and then scan the Register code on the VTH See Step 2 in 4 1 Downloading the App Figure 4 3 Confirm IP address and port number Step 3 Verify the IP address and port number...

Page 97: ...ive video of the VTO and more To receive push notifications of call messages on the mobile phone make sure that notifications of the app are enabled on your smart phone and you are logged in to the ap...

Page 98: ...configured and then tap Forward Select forwarding type as needed Always All calls to this VTH will be forwarded Busy If the VTH is busy the call will be forwarded No Answer Any call that is not answe...

Page 99: ...f the SIP ID to 100 1 1 8001 100 and then all users linked to this VTH will receive the call on their smart phones at the same time Step 5 Tap to enable the forwarding type you selected and then tap O...

Page 100: ...a VTO 4 4 Monitoring Background Information After a VTO is added you can view its live video have two way audio talk call management center and remotely unlock the door Procedure Step 1 Log in to the...

Page 101: ...93 Figure 4 8 Monitor screen Step 2 Tap select the VTO from the channel list as needed...

Page 102: ...e video Switch to another VTO Unlock the door remotely Have a two way audio talk with the VTO Call management center 4 5 Call Records View the incoming and outgoing call records Log in to the APP and...

Page 103: ...lete the record one by one or tap Edit Empty to delete all records 4 6 Message You can view the unlocking records and alarm messages and search for history messages You need to enable Event Subscripti...

Page 104: ...Messages Access and then you can view unlocking records such as unlocking method which user unlocked the door and when the door is unlocked Figure 4 11 Access messages Log in to the App tap Messages A...

Page 105: ...97 Figure 4 12 Alarm messages Searching for History Messages Tap History set the start and end time and then tap SEARCH You search for messages within up to 7 days...

Page 106: ...a pass for a visitor to have access permission The pass is invalid after it is manually invalidated the visiting period expires or the visit is ended You can also view visit records 4 7 1 Creating Pa...

Page 107: ...99 Figure 4 14 Visitor information Step 2 Enter the information of the visitor and then tap Generate Pass Each visitor can only register one plate number...

Page 108: ...or to send the QR code to the visitor Tap Save to save the QR code to your smartphone Step 4 Optional Tap Invalidate to cancel the appointment and then the QR code will not have access permissions Tap...

Page 109: ...e visit and cancelling the appointment You can also view and modify the pass View visitor status Log in to the APP tap Visitor Record View and modify a pass Tap a visitor in the list and then you can...

Page 110: ...102 Figure 4 17 Visitor records 4 8 Setting You can view SIP ID and enable message subscription stream encryption message sound login by pattern and more Log in to the app and then tap Setting...

Page 111: ...arm messages See 4 6 Message for details Stream Encryption Enable it to enhance security but stream acquisition speed might slow down Gesture Draw a pattern and then you can log in by that pattern Abo...

Page 112: ...and view call records and messages 5 1 Downloading DMSS iOS users Search for DMSS in the App store and then download the App Android users Search for DMSS in Google Play to download the App 5 2 Regis...

Page 113: ...e 3 Read the User Agreement and Privacy Policy and then select the I have read and agree to checkbox 4 Tap Get verification code check your email box for the verification code and then enter the code...

Page 114: ...e Me Account Management Modify Password 5 3 Adding VTH to DMSS Procedure Step 1 Power on the VTH Step 2 On the Home screen of the app tap and then select SN Scan Step 3 Scan the QR code at the rear pa...

Page 115: ...network password this module would be displayed For the detailed operation see 3 6 9 Network Password Setting Figure 5 4 Add VTH Figure 5 5 DMSS QR code Step 4 On the Add Device screen enter the devi...

Page 116: ...onfiguring Arm and Disarm Make sure that the VTH and VTO are properly connected Procedure Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the func...

Page 117: ...larm system Custom Arming Arm the system based on your customized needs Disarm Turn the security system off The opposite of arming Figure 5 8 Arm and disarm mode 5 5 DMSS Calling VTH Make sure that th...

Page 118: ...re Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap to call the VTO you added to the DMSS If there are more than one...

Page 119: ...ure 5 10 Calling VTO 5 7 DMSS Unlocking Door Procedure Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap to unlock th...

Page 120: ...e that the VTH and VTO are properly connected Procedure Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap to view the...

Page 121: ...n Play Pause Mute Unmute Change the image orientation to landscape Favorites Select a video tap and then select an existing file that you want to save the video to Video stream Tap the icon to switch...

Page 122: ...larm recorded reported from the VTOs and VTHs Figure 5 14 Viewing alarm records 5 10 Device Sharing Once one user has added the VTH the user can share the binding relationship with other users Procedu...

Page 123: ...115 Figure 5 15 Device sharing 1 Step 3 On the Device Sharing screen tap to scan the QR code of the users you want to share the device Figure 5 16 Device sharing 2...

Page 124: ...r that receives the sharing has to refresh the Home screen to update the sharing information Related Operations To Obtain the QR Code of the User that Receives the Sharing 1 Log in to the DMSS account...

Page 125: ...117 Figure 5 18 Obtain the QR code Figure 5 19 Obtain the QR code 2...

Page 126: ...to prevent unauthorized personnel from carrying out physical contacts such as damaging hardware unauthorized connection of removable device such as USB flash disk serial port etc 2 Change Passwords Re...

Page 127: ...gged in without authorization Check device log By viewing the logs you can know the IP addresses that were used to log in to your devices and their key operations 12 Network Log Due to the limited sto...

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