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Dinstar UC2000-VE User Manual Download Page 99

                                                                      UC2000-VE/F/G  GSM/CDMA/WCDMA  VoIP  Gateway  User  Manual 

_______________________________________________________________________________ 

Shenzhen Dinstar Co., Ltd.

 

98 

4.11.3 Summary   

 

Summary file is enabled by default. Just click download button in case of some of 
system error happened.   

 

4.11.4 SIM card debug   

 

Enable trace while remote SIM card used in this device. 

4.11.5 Ping test 

you can use Ping to check whether the network is working or not. 

Summary of Contents for UC2000-VE

Page 1: ...Manual Shenzhen Dinstar Co Ltd Address 9th Floor Guoxing Building Changxing Road Nanshan District Shenzhen China Postal Code 518052 Telephone 86 755 61919966 Fax 86 755 2645 6659 Emails sales dinstar...

Page 2: ..._ Shenzhen Dinstar Co Ltd 1 Revision Records Document Version Firmware Version Author Date Description V1 0 02 22 23 08 01 Technical Support 2013 07 First release V1 1 02 22 23 10 01 Technical Support...

Page 3: ...e of UC2000 VG 11 1 4 Functions and Features 12 1 4 1 Protocols 12 1 4 2 System Function 12 1 4 3 Industrial Standards Supported 13 1 4 4 General Hardware Specification 14 2 Quick Installation 15 2 1...

Page 4: ...ormation 24 4 4 Statistics 25 4 4 1 TCP UDP 25 4 4 2 RTP 25 4 4 3 SIP Call History 26 4 4 4 IP to GSM Call History 26 4 4 5 CDR Report 27 4 4 6 Lock BCCH History 28 4 4 7 Current call status 29 4 4 8...

Page 5: ...rview 47 4 8 2 SMS Send Limit Settings 47 4 8 3 Send SMS 47 4 8 4 SMS Outbox 48 4 8 5 SMS Inbox 49 4 8 6 USSD 49 4 8 7 Email 49 4 9 Call Configuration 54 4 9 1 SIP Configuration 54 4 9 2 SIP Trunk Con...

Page 6: ...6 4 11 1 Syslog 96 4 11 2 Filelog 97 4 11 3 Summary 98 4 11 4 SIM card debug 98 4 11 5 Ping test 98 4 11 6 Tracert Test 99 4 11 7 Network Capture 99 4 11 8 Voice Loopback Test 103 4 12 tools 105 4 12...

Page 7: ...Show sip Information show sip config 111 Show memory status show memory detail 112 Show SIP port status show sip all 112 Show Current calls sh ecc call 112 Show RTP session sho rtp se 113 Show ASR AC...

Page 8: ...ns VoIP gateway based on IP and Mobile network which provides a flexible network configuration powerful features and good voice quality It works for carrier grade enterprise SOHO residential users for...

Page 9: ...ance of UC2000 VE shows as follow Figure 1 3 1 Front view of UC2000 VE 8G 8C Table 1 3 1 Description of Front view Index Indicators Description 1 RUN On Starting Off Abnormal Blinking every 0 5s Norma...

Page 10: ...tenna Connector Mark as digits 0 to 7 3 Network FE0 and FE1 its default IP address 192 168 11 1 4 Console RS232 standard band rate 115200bps 5 RST Reset button to restore default IP and password or re...

Page 11: ...IM Card Slot SIM card slot mark with 0 15 Back view Indicators and connectors Indicators Name Status Description Power switch Power on or power off the device Power connect AC Input 110 240V FE0 FE1 N...

Page 12: ...us Description SIM Card Status Indicator OFF Indicates SIM is offline SIM status may include SIM card not inserted SIM card not available SIM card unregistered ON SIM card is in use Blinking SIM card...

Page 13: ...ng Hold RST button 7 seconds RUN LED being blink PWR Power indicator OFF No power ON Power on RUN System indicator Blinking 0 5S Device is running normally ON Device is booting up OFF Device is not bo...

Page 14: ...mize IVR Recording White and black list One number access Open API for SMS support USSD Echo Cancellation with ITU T G 168 165 standard Automatic negotiate network Hotline BCCH Support on GSM Gateway...

Page 15: ..._________ Shenzhen Dinstar Co Ltd 14 1 4 4 General Hardware Specification Power Supply UC2000 VE Input 100 240V 50 60Hz Output DC12V 4 0A UC2000 VF G Input 100 240VAC 50 60Hz Temperature Operation 0 4...

Page 16: ...rk interface should be standard RJ45 with 10Mbps or 100Mbps interfaces GSM channels work properly and antennas should be well connected 2 2 INSTALLATION PROCEDURES Connect antennas to the device Conne...

Page 17: ...l 152 192 168 1 10 to set the IP address of the device as 192 168 1 10 192 168 1 10 is just an example 156 Dial 156 192 168 1 1 to set the default gateway of the network as 192 168 1 1 192 168 1 1 is...

Page 18: ...tting 3 3 LOCAL MAINTENANCE THROUGH CONSOLE PORT To ensure easy maintenance the device provides a standard RS232 console port which has a Baud rate of 115200bps Users can log in the device to carry ou...

Page 19: ...ername and password are the same with those of the web interface of device Commands for configuring the IP address of the device In the following example IP address of device needs to be configured as...

Page 20: ...device with Google Chrome or Firefox Browser The configuration introduction also suitable for following models UC2000 VE 4G UC2000 VE 8G UC2000 VF 16G UC2000 VF 8G UC2000 VF 32G UC2000 VE 8C 8 Channe...

Page 21: ...name and password and then click OK in configuration interface The default username and password are admin admin It is strongly recommended change the default password to a new password for system sec...

Page 22: ...d SIP information 4 3 1 System Iinformation Figure 4 3 1 system Information Table 4 3 1 System Information Parameters Description MAC Address Displays the current MAC of the gateway for example 00 1F...

Page 23: ...net flow including the total bytes of message received and sent Version info shows the current firmware version Device Model Model name of the device Package version 02231220 2016 12 16 17 44 40 offi...

Page 24: ...SR Answer Seizure Ratio is a measure of network quality It s calculated by taking the number of successfully answered calls and dividing by the total number of calls attempted Since busy signals and o...

Page 25: ...ement call waiting service Call Hold means the call is hold by extension of IPPBX SIP Server 4 3 3 SIP Information Figure 4 3 3 SIP Information Displays registration status information with Softswitch...

Page 26: ...ameters Description Port The port of RTP statistics Payload Type The voice code of this channel Include G 723 1 PCMA PCMU G 729AB Packet Period Time of packaging Local Port Local port of transmitting...

Page 27: ...m IP side Incoming connected The amount of incoming calls which have connected Incoming Answered The amount of incoming calls which answered by GSM CDMA modular Incoming Failed The amount of incoming...

Page 28: ...lls in this port Duration Statistics call total time Answered Statistics response times Call Failed Caused by SIP Statistics cause of call failure from SIP include canceled timeout not allowed Negotia...

Page 29: ...ftswitch IPPBX to mobile network GSM to IP incoming calls from mobile network to IPPBX Softswitch Source Calling number Destination Called number Stauts Answered the call was established successful Ca...

Page 30: ...y of BCCH to help analysis SIM card register status 4 4 7 Current call status On the Statistics Current Call Status interface status and detail of the current call are shown 4 4 8 GSM Event GSM event...

Page 31: ...nabling Use the Following IP Address Configure the IP Address Subnet Mask and Default Gateway by manual PPPoE Need ISP offer the account and password Use this mode when there is not router in the loca...

Page 32: ...the gateway can automatically find the network device on the same segment But sometimes you don t want to use this automatic mapping you d rather have fixed static associations between an IP address...

Page 33: ...account which provide by server or VPN provider Password Password of VPN which provide by server or VPN provider Domain Follow VPN setting can be null Use MPPE Encryption parameter support 40 128 bit...

Page 34: ...or reject the login of other people via Web or Telnet UDP accept or reject the calls from a specific port ICMP accept or reject PIN packages All accept or reject all the above mentioned items 4 7 MOBI...

Page 35: ...ssword of SMS Sever must be correctly configured and the TCP Intercept function of the SMS Server must be enabled Once the connection between the gateway and TCP is established the gateway will send u...

Page 36: ...higher computational complexity which in a mobile device can potentially result in an increase in energy consumption as high as 5 compared to old FR codec AMR Adaptive Multi Rate is an audio compressi...

Page 37: ...MA VoIP Gateway User Manual _______________________________________________________________________________ Shenzhen Dinstar Co Ltd 36 Then click OK and start service the gateway IP will be presented...

Page 38: ...phone Detect Reverse Polarity If the function is enabled the caller will learn whether the called person has got through the phone Tx Gain Gain of voice sent Rx Gain Gain of voice received Network Mo...

Page 39: ...en pulled out and inserted into another port Select Yes on the right of Write Phone Number to SIM Card enter a phone number and click Submit 4 7 4 PIN Management PIN code is a combination of numbers u...

Page 40: ...__________________________________________________ Shenzhen Dinstar Co Ltd 39 Select Port Selects the GSM CDMA channel number 4 7 5 IMEI IMEI Modify to change the IMEI code for specific port ports IME...

Page 41: ...n Dinstar Co Ltd 40 4 7 6 Operator Click Search button while there is SIM card in that port after a while you will see Operator codes list under Operator List dropbox And then select correct operator...

Page 42: ...a logical broadcast channel used by the base station in a GSM WCDMA network to send information about the identity of the network The information is used by a mobile station to get access to the netwo...

Page 43: ...right of BCCH Mode and select a mode Default All frequencies will be automatically matched with the gateway Fixed You are required to set three fixed frequencies and the frequencies will be matched w...

Page 44: ...minimum answer seizure ratio ASR number of calls and number of failed calls Note When the actual number of failed calls reaches the set number frequencies will be switched or when the actual answer se...

Page 45: ...onditional Calls will be forwarded unconditionally Call Forwarding No Reply If there is no reply from the called number calls will be forwarded Call Forwarding Busy If the called number is busy calls...

Page 46: ...f SIM card For more details of these services please contact to local providers Notes Call waiting is only take effective while Do Not Answer GSM Incoming Call for Hotline set to Yes Call Configuratio...

Page 47: ...It can be null Domain Name The name of the sub domain used by the gateway under the Could server Password The password of the sub domain used by the gateway under the Could server Local Port The port...

Page 48: ...USSD 4 8 1 SMS Send Overview On the SMS Send Overview interface you can see the number of SMS messages that have been sent via the ports of the gateway as well as the daily limit and monthly limit of...

Page 49: ...nation Port The port through which SMS messages are sent To The number s where the SMS message will be sent UCS2 UCS2 Support English and Chinese GSM 7bit Support English only Message The content of t...

Page 50: ...provided by a telecom operator and allows GSM WCDMA mobile phones to interact with the telecom operator s computers USSD messages travel over GSM WCDMA signaling channels and are used to query informa...

Page 51: ...email if the subject matched will extract the context from key words To Encoding Message as SMS receive number SMS encoding SMS context If the GSM gateway have not available channel at that time it wi...

Page 52: ...services server info you can get it from your email provider The TLS Enable means use Encrypt or not If use TLS IMAP default server port is 993 POP3 default server port is 995 If not use TLS IMAP def...

Page 53: ...Test SMS the Subject s field in GSM gateway must be Test SMS also Email contents usually include 3 parts The To means destination number you want send to this option is obligatory The format is To xxx...

Page 54: ...the email senders use other encoding like 7Bit it will not support 3 Email size The email size can t more than 300 chars if more than it the UC2000 will not try to read it How to set SMS to Email The...

Page 55: ...provider SMTP Username Enter your e mail address username SMTP Password Enter the password of the e mail address you configured please make sure it is correct TLS Enable Enable the TLS or not If your...

Page 56: ...set to Yes the gateway will send SIP OPTION periodic to check health status between gateway and SIP server Outbound Proxy Outbound proxy it mainly used in firewall NAT environment That make the signal...

Page 57: ...nterworking with SIP server so that the gateway able to deal with high performance concurrent calls Use the same local SIP port and SIP User ID Use the separate SIP port Each channel has separate SIP...

Page 58: ...s But in fact the gateway will get 200OK response from SIP server after REGISTER request and an Expires header will be included in 200 OK message body This value in the 200OK determines the time in se...

Page 59: ...TMAX Default value is 32000 Keepalive Interval The gateway can monitor the status of SIP server by sending periodic SIP OPTION messages This field specifies transmission timer of OPTION message Its ra...

Page 60: ...er ID sip 3001 host com tag 51088abb User User From 3001 sip 3001 host com tag 51088abb Tel Tel From Caller ID sip Caller ID host com tag 51088abb User Tel From 3001 sip Caller ID host com tag 51088ab...

Page 61: ...on and to release it if it is not active even if a BYE has not been received Session timer Interval The initial INVITE request establishes the duration of the session and may include a Session Expires...

Page 62: ...4000 refresher uac Max Forwards 70 To Bob sips bob biloxi example com tag 9as888nd From Alice sips alice atlanta example com tag 1928301774 Call ID a84b4c76e66710 CSeq 314162 UPDATE Contact sips alic...

Page 63: ...be as below 4 9 2 SIP Trunk Configuration Table 4 11 1 Description of IP Trunk Parameters Description SIP Trunk Add remote IP of Softswitch SIP server which will send call traffics to gateway Index I...

Page 64: ...Trunk Group Example Keep alive Send OPTION to Softswitch IPPBX to detect health status Parameters Description IP Trunk Group This configuration is optional and is used to add the IP that have the same...

Page 65: ...10 14 17 to IP group 18 Figure 4 11 4 IP Trunk group modify 4 9 4 Port Configuration Figure 4 12 4 Port Configuration Table 4 12 3 Description of Port Configuration Parameters Description Port Config...

Page 66: ...Adjusting it will effect volume on GSM side Rx Gain Rx Gain value of chipset Adjusting it will effect volume on IP side To VoIP Hotline When mobile fixed line users make call to this port gateway will...

Page 67: ..._________________________________________________________________ Shenzhen Dinstar Co Ltd 66 4 9 6 Digitmap Digit Map Syntax 1 Supported objects Digit A digit from 0 to 9 Timer The symbol T matching a...

Page 68: ...ns or DTMF symbols 5 Subrange Two digits separated by hyphen which matches any digit between and including the two The subrange construct can only be used inside a range construct i e between and 6 Wi...

Page 69: ...xxxxxx 13xxxxxxxxx Means that first is 2 3 4 5 6 7 or 8 followed by 6 digits or first is 13 followed by 9 digits 3 13 15 18 xxxxxxxxx Means that first is 13 15 or 18 followed by 8 digits 4 1 357 9 xx...

Page 70: ...port or port group Call Restriction allow or forbid to call out Source Prefix to match with prefix of caller number Destination Prefix to match with prefix of called number Prefix to add to add a pref...

Page 71: ...________________________________________________________________________ Shenzhen Dinstar Co Ltd 70 Remove prefix 991 of called number Remove prefix 88 and then add 0 in front of called number 4 9 8 T...

Page 72: ...rver or SIP trunk Destination indicates call to which port or port group Call Restriction allow or forbid to call out Source Prefix to match with prefix of caller number Destination Prefix to match wi...

Page 73: ...e number till it getting answer Notes Refer to Port Parameter page for Hotline configuration Enable PSTN Incoming Configuration Means when call from mobile side you can dial the feature codes Chapter...

Page 74: ...only Redirect Call when All Port Busy When the gateway is running heavy traffic and not possible to call out the call will redirect to specific destination route as configuration IP and Port destinat...

Page 75: ...enable local services like 158 etc User ID Is Phone Number Default is No user phone will be added in SIP message body when this option enabled Only Accept Calls from SIP Server Default is No All calls...

Page 76: ...eter Local Start RTP Port Means the initial port when RTP voice stream transmit in the IP network in general using the factory default values When there are several DINSTAR units are deployed and they...

Page 77: ...480Hz on 2000ms off 4000ms Busy Tone 480 330 620 330 500 500 0 0 frequency 480 620Hz on 500ms off 500ms DTMF Parameter UC2000 VE F G support RFC2833 and SIGNAL two ways DTMF INTERVAL range is 50 800m...

Page 78: ...Manual _______________________________________________________________________________ Shenzhen Dinstar Co Ltd 77 Configure DBO parameter More parameter showing on the interface after enable DBO the...

Page 79: ...ticate password which provide by DBO server The gateway will not allow to pass the traffics if the username and password match with the server Standby DBO Server URL IP Secondary DBO server IP or doma...

Page 80: ...oper license 4 10 HUMAN BEHAVIOR 4 10 1 Overview On the Overview interview you can see the number last matched balance the balance that is assigned last time calculated balance the remaining balance r...

Page 81: ...call The GSM gateway provide 3 modes to learn SIM card number USSD SMS Call 1 USSD Send USSD to carrier and get the response For example send 156 get response Your number is 8618344144906 So configur...

Page 82: ...nd SMS My Number to 10086 the carrier reply SMS Your number is 8618344144906 So configured the Dest Number to 10086 the Send Text to My Number the Check SMS From Number to 10086 the Keywords to Your n...

Page 83: ...use China Mobile recharge press 1 check balance press 2 other services press 3 press 3 it will play IVR check current package press 1 check phone number press 2 press 2 the carrier reply MSG Your numb...

Page 84: ...onfiguration work we can use the Matching Test Input the Your number is 8618344144906 at Test SMS Text press the Test you will get the match result 4 10 4 Balance Check On the Balance Check interface...

Page 85: ...balance by USSD Send USSD to carrier and get the response For example send 101 get response Your balance is 73 40 So configured the Keywords to Your balance is the gateway will take the number 73 40 F...

Page 86: ...en Dinstar Co Ltd 85 2 Check balance by SMS Send SMS to carrier and get the response For example send SMS My balance to 10086 the carrier reply SMS Your balance is 73 40 So configured the Dest Number...

Page 87: ..._____________________________________________________________ Shenzhen Dinstar Co Ltd 86 For make sure the configuration work we can use the Matching Test Input the Your balance is 73 40 at Test SMS T...

Page 88: ...press 3 press 3 it will play IVR check current package press 1 check balance press 2 press 2 the carrier reply MSG Your balance is 73 40 So configured the Dest Number to 10086 the Send Text to p5 3 p3...

Page 89: ...etting Billing setting mainly use to limit call time of SIM cards see also call limit Minimum Charging Time set minimum charging time some operator does not charge if the call is less than some second...

Page 90: ...port can use 0 means no limit If you set 600 it means the port can use 600 credits at most Daily Credits set daily credits it defines the maximum credit the port can use in one day 0 means no limit If...

Page 91: ...eflects an average length of telephone calls transmitted on telecommunication networks ASR The Answer seizure ratio is a call success rate in telecommunications it is the percentage of answered teleph...

Page 92: ...ble CDR 4 Configure the Low abnormal call handle Click Human Behavior and exception event handle then select yes the configuration page will be displayed Low ASR Less Than This value is the threshold...

Page 93: ...se of the call of failure gateway will record these error codes until the gateway was restarted The error code 8 meaning of Operator determined barring indicates precisely that the SIM was blocked by...

Page 94: ...mation page Handle abnormal event Once one of the above abnormal condition is detected gateway could Reset the specified GSM module Block the specified GSM module Block the SIM this setting only avail...

Page 95: ...same device also you can make call or send SMS to other numbers Why need Auto Generation Because the device used to call out as a landing a large number of outgoing easily be detected abnormality so w...

Page 96: ...ether to retry Call Duration you can set any time you want Automatic call duration will between the Min and Max Auto Send SMS Auto SMS between the same device ports Conditions Settings define the valu...

Page 97: ...to notify administrators of problems or performance There are 5 levels of syslog Including NONE DEBUG NOTICE WARNING and ERROR The Signal Log is include following traces which defined in system by de...

Page 98: ...s include following traces which defined in system by default CLI command line TEL LOAD firmware upload SNMP WEBS embedded web server PROV provisioning Server Syslog When the gateway register to SIM C...

Page 99: ..._______________ Shenzhen Dinstar Co Ltd 98 4 11 3 Summary Summary file is enabled by default Just click download button in case of some of system error happened 4 11 4 SIM card debug Enable trace whil...

Page 100: ...__________________ Shenzhen Dinstar Co Ltd 99 4 11 6 Tracert Test You can check the routes of the tracert destination 4 11 7 Network Capture Network capture is a very important diagnostic tool for mai...

Page 101: ...CM capture Dialing out through gateway start talking a short while then hangup the call Click Stop to disable network capture Save the capture file to local computer The capture is named to capture x...

Page 102: ...ough gateway start talking a short while then hangup the call Click Stop to disable syslog capture Save the capture to local computer The capture is named to capture x pcap x is serial number of captu...

Page 103: ...time The sample of RTP capture as below Getting start to DSP capture DSP capture is help to analysis voice stream inside DSP chipset The DSP chipset will handle RTP from IP network as well as voice st...

Page 104: ...Ltd 103 Configurable capture options Getting start to custom capture This menu provides more options to capture specific packets as actually needs 4 11 8 Voice Loopback Test Voice Loopback test shoul...

Page 105: ...obile To start DSP TDM Test Make a call test through gateway the call can be initialed by IPPHONE Keep the conversation after call establish Click DSP TDM Test to start test Check the voice on both si...

Page 106: ...es GSM side become silence and echo should be generated on IPPHONE side Hang up 4 12 TOOLS 4 12 1 File Upload On the Tools Firmware Upload you can upload a firmware to upgrade the device But you need...

Page 107: ...from an older firmware version and use it in a unit with a more recent firmware version However a backup file from a newer firmware version than the one actually in the unit cannot be used for a rest...

Page 108: ...ess the device remotely With the Remote Server device can register to it and access web telnet through Remote Server remotely Register Remote Server account from web site server02 dmcld com 3000 4 12...

Page 109: ...ccess control You need to set a new password to control access level of web links After set password you can set which page is allow disallow to access by default user 4 12 9 Factory Reset Be careful...

Page 110: ...o make sure the system runs successfully we suggest customers setting UC2000 by GUI In this manual some topics such as how to check the IP signaling and call conversation are covered Tips The document...

Page 111: ...Ltd 110 5 2 COMMANDS IN ROS MODE There is only a litter commans in ROS mode If you need more commands you must enter the ROS mode Input enable to enter ROS mode if you have in the ROS mode 5 2 1 SUMMA...

Page 112: ...WCDMA VoIP Gateway User Manual _______________________________________________________________________________ Shenzhen Dinstar Co Ltd 111 Show Time show clock Show version show version Show sip Infor...

Page 113: ...P Gateway User Manual _______________________________________________________________________________ Shenzhen Dinstar Co Ltd 112 Show memory status show memory detail Show SIP port status show sip al...

Page 114: ..._____________________________________________________________ Shenzhen Dinstar Co Ltd 113 Show RTP session sho rtp se Show ASR ACD statistics show ecc state 5 3 COMMANDS IN CONFIG MODE 5 3 1 SUMMARIZE...

Page 115: ...VE F G GSM CDMA WCDMA VoIP Gateway User Manual _______________________________________________________________________________ Shenzhen Dinstar Co Ltd 114 Input to show the all commands and its infor...

Page 116: ...Dinstar Co Ltd 115 5 3 2 GENERAL PURPOSE COMMANDS IN CONFIG MODE Set time clock set Save the configuration save Restart device reset eia Enable debug The command format is deb port port number to enab...

Page 117: ...5 4 HOW TO TRACE SIP LOGS Create telnet session to gateway the main steps as below Welcome to Command Shell Username admin Password ROS en ROS ROS config ROS config deb sip msg all ROS config ex ROS R...

Page 118: ...ROS config deb port all Debug All enable trace on all port ROS config ROS config deb port 0 Succ Debug PortNo 0 enable trace port 0 ROS config ROS config no deb port all ROS config ROS config ex ROS a...

Page 119: ...___________________________________________________ Shenzhen Dinstar Co Ltd 118 ROS ada ADA CONNECTED WELCOME ROS ada cmd 53 19 0 0 1 enable trace 0 0 means port range 0 to 0 0 8 means port range from...

Page 120: ...eway Control Protocol DTMF Dual Tone Multi Frequency USSD Unstructured Supplementary Service Data PSTN Public Switched Telephone Network STUN Simple Traversal of UDP over NAT IVR Interactive Voice Res...

Page 121: ...WCDMA VoIP Gateway User Manual _______________________________________________________________________________ Shenzhen Dinstar Co Ltd 120 NAT Network Address Translation RTP Real time Transport Proto...

Page 122: ...signed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in...

Page 123: ...posure Statement To maintain compliance with FCC s RF Exposure guidelines This equipment should be installed and operated with minimum distance of 20cm the radiator your body This deviceand its antenn...

Page 124: ...es uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee th...

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