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33

9. Signaling NAT Traversal

This setting is not required if the target SIP server / PBX supports NAT traversal.
However, if your ISP blocks VoIP traffics, you could try to use Relay Proxy setting.
Depending on how your ISP blocks VoIP traffics, the Relay Server method may or may
not work in your network environment.
Two NAT Traversal methods are supported:
1. Stun Server – An external Stun Server is required. This allows the device to

obtain the public IP of the network used.

2. Relay Proxy – Enter the IP address or the domain name of a Relay Proxy. Please

contact technical support for further assistance.

None

10. Advanced Timings



No Answer Expiry
(32-180s)



NICT Expiry (2-180s)



ICT Expiry (5-360s)



Retransmit T1
(200-2000ms)



Retransmit T2
(20000-8000ms)

This section consists of 5 basic timers in the SIP protocol. Configure them carefully so

that they are compatible with the SIP Server and your requirements.

This timer specifies the timeout for an unanswered call. A SIP 408 Request Timeout
command is sent to the SIP Server when this timer expires.

Note: The default value is set the maximum value so that it will not interfere with the
call unanswered timeout at SIP Proxy or PBX.

NICT: Non Invite Client Transaction (RFC 3261 Section 17.1.2)

ICT : Invite Client Transaction (RFC 3261 Section 17.1.1)

Round Trip Time (RTT) estimate (RFC 3261 Section 17.1.1)
This timer applies to the following timeout timer.
1. INVITE request retransmission interval, for UDP only
2. Non-INVITE request retransmission interval, UDP only
3. INVITE response retransmission interval.

The maximum retransmit interval for non-INVITE requests and INVITE

responses.

180

2

5

200

2000

11. GSM-SIP Code Map

When making a GSM call, a GSM specific cause defined in GSM04.08 Annex H is

returned from the network for call control. This GSM cause must be returned back to
the SIP server for call handling and control. In order to meet various application
requirements, the GSM-SIP Code Map allows the user to define the corresponding SIP
message for each GSM cause listed below .

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Summary of Contents for GoIP

Page 1: ...1 GoIP User Manual VoIP GSM Gateways Models GoIP GoIP 4 4i GoIP 8 8i WoIP 8 GoIP 16 GoIP 32 Revision 1 5 2016 6 24 ...

Page 2: ...ion 19 5 3 1 Preference 19 5 3 2 Network 22 5 3 3 Basic VoIP 24 5 3 4 Advanced VoIP 31 5 3 5 Media 34 5 3 6 Call OUT 36 5 3 7 Call OUT Auth 39 5 3 8 Call IN 40 5 3 9 Call IN Auth 43 5 3 10 SIM 44 5 3 11 SIM Forward 46 5 3 12 IMEI 47 5 3 13 SMS 48 5 3 14 GSM Carrier 51 5 3 15 GSM Base Station 51 5 3 16 Event Trigger 53 5 4 Tools 55 5 4 1 Online Upgrade 55 5 4 2 Change Password 55 5 4 3 Send USSD 56...

Page 3: ... 61 5 4 12 Reset 62 5 4 13 Reboot 62 Appendix A Special SMS Commands 63 Appendix B SMS To VoIP 64 Appendix C Custom Network Tones 68 Appendix D GSM Group Mode 69 Appendix E CID Call Forward 70 Appendix F Volume Adjustment 71 ...

Page 4: ...ion which causing poor performance Please note that the antenna for WoIP 8 is about 4 inches long and the one for GoIP 8 is just 2 inches long The device configurations for WoIP is in general the same as those in GoIPs 3 General 3 1 Introduction GoIP and WoIP are abbreviated from GSM over IP and WCDMA over IP respectively They are new types of VoIP gateway that allows call terminations from a VoIP...

Page 5: ...ls to another GSM number in the world via a VoIP service provider The charge per call from a VoIP service provider is significantly lower than the roaming charge For office environment GoIP WoIP offers a quick way to replace the traditional PSTN lines or T1 E1 lines to your IP PBX There is no initial installation reallocation charge and no need to wait for installation Depending on our usage you c...

Page 6: ...lified PPPoE Dial Up Router function DHCP client Server QoS VLAN VPN PPTP Online firmware upgrade Remote Control Mechanism for remote technical support Proprietary Auto Provisioning Mechanism Remote SIM function Short Messages SMS support standalone and server based Call Management and Routing 3 5 Package Content Use care when unpacking the device package in order to avoid damage to the main unit ...

Page 7: ...7 Item Appearance Description 1 GoIP 1 Channel GoIP 4 4 Channel GoIP 8 8 Channel WoIP 8 8 Channel GoIP 16 16 Channel GoIP 32 32 Channel 1 x Main Unit 2 AC DC Power Adapter GoIP1 12V 500mA ...

Page 8: ...Description Power This LED is red and illuminates when power is connected LAN This LED is red and illuminates when the LAN port is connected and blinks when data transmission occurs PC This LED is red and illuminates when the PC port is connected and blinks when data transmission occurs RUN This LED is green and blinks at a rate of every 100ms when VoIP is not ready for making calls Fast Blink It ...

Page 9: ...el individually via the web interface 1 SIM card slots are located either at the bottom for old hardware or at the back for new hardware of the main unit For the models with the SIM card slots located at the bottom you need to open the bottom SIM cover in order to install SIM cards First slide the metal clip to the direction as indicated on the top of the clip Insert a SIM card to each slot carefu...

Page 10: ... figure below The cut corner is pointing downward with the metal contacts facing the front of the GoIP For GoIP 32 the SIM card insertion orientation is shown in the figure below The cut corner is pointing downward with the metal contacts facing the front of the GoIP ...

Page 11: ...ter mode the PC port is set to a different network segment In this case please make sure that the PC network segment IP 192 168 x is different from the one in the LAN port network 4 The DC port is for power connection Please use the AC DC adapter provided Using an adapter from a difference vendor or with different ratings may damage the device or affect its performance 5 The Reset button is recess...

Page 12: ...call is answered dial 01 to hear a voice prompt reporting the LAN port IP address ii Send the INFO SMS command to one of the GSM channels available An SMS with the LAN port IP address is sent back to the message sender Please refer to the Appendix A Special SMS Commands for more information Once the LAN IP address is known you are now ready to access its built in http web server by typing its IP a...

Page 13: ...password to a more complicated pattern 4 Current Time This shows the current time which is obtained from the network time server specified If the time is not correct there may be an issue with the network connection There are four pages under the Status section 1 Summary 2 General 3 GSM 4 SIM Call Forward All 4 status pages are updated automatically in every 5 seconds It is important to understand...

Page 14: ...a VoIP call The generation of a second dial tone prompts the caller to press a phone number The Status changes to ACTIVE since the start of the second dial tone till a phone number is received for dialing or the call is terminated d DIALING phone number This occurs when the GoIP is dialing out a phone number via the corresponding GSM channel or The DIALING status shows that a number is being diale...

Page 15: ...eld shows the serial number of the device b Firmware This field shows the current firmware version c Model This field shows the model number of the device d Local Time This shows the current system time It is a good indication for normal network access provided that the network server address and time zone are set properly Please make sure that these information are provided when reporting a probl...

Page 16: ...N means the corresponding line fails to register to the server d Routing Prefix This shows the current setting for the Routing Prefix If it is set the Routing Prefix is used to select the corresponding channel to dial out a call Please refer to Section 3 3 3 for more information GSM e CH This corresponds to the physical GSM channel number f Login This shows the current GSM Registration status for ...

Page 17: ...rrier 8 GSM BSC mode This shows the current setting for the GSM BSC mode which determines how the device selects a base station For more information please refers to the section 3 3 15 9 Cell ID This shows the Base Transceiver Station BTS ID 10 LAC This shows the Location Area Code The bottom table shows more detailed information on the onboard GSM modules and the SIM card inserted 1 Module The mo...

Page 18: ...ion takes place 3 Not Set This means that there is no change to the current Call Forwarding mode and nothing is sent to the GSM network when a new GSM registration takes place This is useful by leaving the current Call Forward mode unchanged ...

Page 19: ...19 5 3 Configuration Click Configuration on the left hand column to display the Configuration page Under this section there are 16 items in the submenu as shown below 5 3 1 Preference ...

Page 20: ...ntrol Remote Server Remote Server Port Remote Server ID Remote Server Password This is a unique feature that allows remote access to the device s built in Web server even when it is installed behind NAT To achieve this function a Remote Control Server is required to be installed This server is a free Linux based utility and is available for download via our website Please contact technical support...

Page 21: ...ou need further help on this The default DDNS Address is voipddns net which a free service offered by the manufacturer Please contact technical support if you want to install your own DDNS server The default communication port number is 39800 This specifies the interval between registrations to the DDNS voipddns net 39800 120 mins 9 Auto Reboot Reboot Time This option allows the device to reboot i...

Page 22: ...nditions short dropouts may occur due to packet jitter loss Therefore DTMF digit may be detected more than once if these dropouts are not taken into account Consequently the call is dialed to an incorrect number To avoid this problem a dropout window is used to avoid false detection when dropouts occur During this window the same DTMF digit is not recognized more than once The range of the dropout...

Page 23: ...s both Router and Bridge modes to meet your requirements 1 Static IP default setting This mode enables the device to create another network segment and it then functions as a router gateway for this new network segment Select Static IP for this new segment and then enter the PC port IP address and Subnet Mask accordingly It also has a built in DHCP server to assign IPs to the devices attached to t...

Page 24: ...re upgrade links available In general it is important to understand your VoIP application with the device before proceeding to device configuration If the device is going to work with a IP PBX please make sure that you know how to configure your IP PBX It is very important that you send us your application requirements in full details when seeking for technical support in configuring the device In...

Page 25: ... call is rejected by sending back a SIP 503 message b Only some Routing Prefixes are set Try to match the number received for making an outgoing call against those Routing Prefixes that are set If only one match is found the corresponding channel is used to make the outgoing call If more than one matches are found the best available channel among the matched channels is selected If no match is fou...

Page 26: ...26 ...

Page 27: ... Server address This specifies the backup Home Domain address Disabled 12 Routing Prefix This parameter is used for call routing When this is set the corresponding channel is only used to dial out a phone number with the matching Routing Prefix Syntax Prefix1 Prefix2 Prefix3 where Prefix is a text string which consists of digits alphabets and special characters The maximum length of the Routing Pr...

Page 28: ...except GoIP 1 This mode is basically a combination of Single Server mode and Config By Line mode It allows lines to be split up into groups Each group only uses one SIP registration for all the lines assigned to the group Each line can be assigned to only one of the 4 predefined groups in the Grouping section In this mode the Routing Prefix is assigned to the Group rather than to the Channel Its f...

Page 29: ...roperly depending on the SIP Server and the router configurations on each side as well In this case the SIP server is required to support NAT Both routers should also be setup to map the signaling port and media ports to the SIP Server and the GoIP properly Otherwise VoIP calls may fail to establish properly in this network environment The device accepts calls from up to 3 IP addresses SIP Trunk G...

Page 30: ...e are listed in the table below Parameter Trunk Gateway mode Description Default Value 1 SIP Trunk Gateway1 This specifies the first SIP Trunk Gateway address Use X or x for the last part of the address to specify the entire segment 0 255 2 SIP Trunk Gateway2 This specifies the second SIP Trunk Gateway address Use X or x for the last part of the address to specify the entire segment 0 255 3 SIP Tr...

Page 31: ...to Fixed 5060 2 SIP INVIITE Response One of the key function of the device is to allow call terminations from VoIP to GSM In general a VoIP caller dials a PSTN or GSM number E 164 number and the SIP Server routes this call to the device by sending a SIP INVITE message This parameter specifies the response to the INVITE message The three possible responses are described in details below 1 SIP 200 O...

Page 32: ...oose Enable to activate this SIP proxy to accept any SIP registrations with the correct password which is specified in the parameter Password There is no need to create a SIP account in this server Users will have to manage the SIP numbers used on their own This facilitates the setup of a simple SIP network for customers who do not have their own SIP servers This sets the password for SIP registra...

Page 33: ...specifies the timeout for an unanswered call A SIP 408 Request Timeout command is sent to the SIP Server when this timer expires Note The default value is set the maximum value so that it will not interfere with the call unanswered timeout at SIP Proxy or PBX NICT Non Invite Client Transaction RFC 3261 Section 17 1 2 ICT Invite Client Transaction RFC 3261 Section 17 1 1 Round Trip Time RTT estimat...

Page 34: ... the user to program various settings for media voice transmission and format Depending on your network environment and condition you may or may not need to change these settings Please see the parameter table below for more information ...

Page 35: ...tter buffer function looks at the packet timestamp for dropped or out of sequence packet problems The data packets are sorted based on the packet timestamp 3 Adaptive The adaptive mode optimizes the size of the jitter buffer delay and depth in response to network conditions in addition to the sequential mode functions This specifies the fixed jitter delay for both Fixed and Sequential Jitter Buffe...

Page 36: ...hown below a law law G 729 G 729A G 729AB G 723 1 5 3 6 Call OUT The Call Out page defines how each GSM channel handles calls when they are routed from VoIP This section MUST Be defined properly in order to enable each GSM channel to dial out calls based on your requirements In general you can achieve the followings 1 Forward all incoming VoIP calls to a fixed GSM or PSTN number 2 Dial out all inc...

Page 37: ...message Please refer to Section 3 3 3 1 for more information Calling the SIP number directly routes the call to the corresponding line immediately If this parameter is blank and the Callee Number equals to the SIP Number defined for this line a second dial tone is generated to wait the caller to dial a phone number Please note that this could only happen in the Single Server mode Config by Line mo...

Page 38: ...for matching starting from the beginning of the Callee Number The right portion b c is the action to be taken Both b and c are optional b means that b is removed from the beginning of the Callee Number If b is not found starting from the beginning of the Callee Number c means that c is added to the beginning of the Number generated from the last action In order for this rule to be meaning b must b...

Page 39: ...ess whether the call is completed successfully or not 2 Answered Calls The Sleep Interval is activated whenever an outgoing call is answered 5 3 7 Call OUT Auth The Call Out page defines how each GSM channel handles calls when they are routed from VoIP This section MUST Be defined properly in order to enable each GSM channel to dial out calls based on your requirements In general you can achieve t...

Page 40: ...rompt to wait for further inputs from the caller The GSM call is answered and GSM charges may apply This is referred as the Second Dial mode 4 Forward incoming GSM calls to the host channel to other idle GSM channels This enables a multi channel GoIP and or multiple GoIPs to simulate the Calll Center function Therefore only the phone number of the host channel is released for the public to call in...

Page 41: ...e incoming GSM calls Enable 4 Forwarding to VoIP Number This parameter enables or disable an incoming GSM call to the selected channel to be forwarded to the SIP extension specified If this parameter is blank incoming GSM calls are not forwarded automatically Instead they are answered with a dial tone or a voice prompt IVR parameter enabled in the Preference page the device answers an incoming GSM...

Page 42: ...old is then resumed 7 Hunt Group Mode Forward Mode Backup Host Address Hunt Group operation is discussed in details in Appendix D Please note that Hunt Group Mode is a property of each GSM channel and is required to be set individually Host This enables the channel selected to be the Host of the Hunt Group operation All clients registers and update the host on their channel status The host then ma...

Page 43: ...iption Default Value 1 Call In Auth This parameter defines how incoming GSM calls are authenticated before routing them to the VoIP network connected Five options are available 1 None No authentication is required all incoming GSM calls are routed to VoIP 2 Password The caller is prompted for entering the password before the call is routed or a second dial tone is generated 3 Whitelist Only calls ...

Page 44: ...g this button automatically duplicates the same settings to all other channels with the exception that the SMS Alert ID is incremented by 1 with respect to the ID of the previous channel The parameters for this section are described in details in the table below Parameter SIM Card Description Default Value 1 GPRS Registration This enables the GPRS registration mode for all GSM channels Enable 2 SI...

Page 45: ...s specifies a time period of one day starting from 00 00 till the end of the day Example 2 08 00 12 00 100 12 00 20 00 200 In this example the first period starts from 08 00 till 12 00 with a talk time limit of 100 minutes The second period starts from 12 00 till 20 00 with a talk time limit of 200 minutes From 20 00 till 08 00 the next day there is no talk time limit 3 Talk time allowed monthly T...

Page 46: ... the incoming calls when it is not answered 4 No Service Forward all incoming calls when the SIM cannot register to the network There are 3 choices for each Call Forward condition 1 Set This enable the Call Forward function This setting is sent to the network whenever the SIM is starting a new registration to the network 2 Disable This disable the Call Forward function This setting is sent to the ...

Page 47: ...urer and the brand model The following six digits CCCCCC are the serial number The last digit is the check digit which is calculated according to Luhn formula The Check Digit is calculated of all other digits in the IMEI The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR Central Equipment Identity Register and EIR equipment The check digit is v...

Page 48: ...irst time after the last is pressed The default value for Change Period is 60 i e 1 hour The minimum value allowed is 10 A random IMEI only the portion CCCCCC is changed TAC portion remain unchanged can also be assigned by enabling the option Set Random IMEI when Module Powers up This feature is important to make sure that a new IMEI is assigned to each GSM channel whenever it powers up A GSM chan...

Page 49: ...rameter specify which SMS Dial mode is used Please refer to Appendix B for more information on the modes available The parameter is applicable for SMS Dial mode It allows a prefix to be added to the phone number of the called party 2 Forward Function This mode forwards incoming GSM SMS to a SIP terminal and a GSM number Incoming GSM messages SMS received are forwarded to the SIP Phone Number speci...

Page 50: ...in the SMS Server This specifies the login password for the SMS Client ID 44444 2 SMS Number Plan The function of this parameter is similar to the Dial Plan for calling It is used to modify the phone numbers of the SMS recipients It has the same syntax as the Dial Plan which is described in the Section 5 3 6 for more information When no rules are matched SMS will be sent to the original number rec...

Page 51: ...ection mode The factory default setting is Auto for automatic selection of GSM service provider based on the default preference set by the SIM card When a GoIP is installed at a location that is close to a country border it is possible that the default service provider is not selected based on the base station signal strength The GoIP may then register to a GSM service provider that charges for ex...

Page 52: ...er of channels in the Polling Channel List 4 2 Channel Switching Interval m This defines the duration in minutes when the next base station switching occurs Other than a single value a range can also be specified using the format min max where min is the minimum interval and max is the maximum interval A random value in the range specified is then assigned when a channel switching occurs which onl...

Page 53: ...form the corresponding action in the same channel The Event Triggers defined are shown below Defined Events 1 Channel ACD is less than the time in seconds specified 2 Channel ASR is less than the percentage specified 3 This specifies a time duration to repeatedly execute the action specified 4 This refers to outgoing GSM calls that has no ringback tones returned from the network and the call is no...

Page 54: ...he number consecutive calls are allowed When the preset conditions are met the predefined action is executed Defined Actions 1 Null No action 2 Disable VoIP connection This causes the GoIP to deregister from the SIP Server for the corresponding line 3 Disable Call Out via GSM This prevents calls from dialing out from the corresponding GSM channel 4 Shut down GSM Module This shuts down the correspo...

Page 55: ...Please wait patiently as this process may take a few minutes Note It is important NOT to disconnect the power during a firmware upgrade since the internal Flash may be corrupted If this happens pleases contact technical support for assistance Please reboot the device if an upgrade attempt fails before performing another upgrade 5 4 2 Change Password Click Change Password to change the password wit...

Page 56: ...mber are displayed The last option All Lines means that all channels are selected and the same USSD command is sent via all channels provided that they are in the LOGIN Status b Enter the USSD command c Click Send Example For the service provider PCCW in Hong Kong the USSD command to check balance is 122 Enter 122 and the click Start The following screen is then displayed A few seconds later the s...

Page 57: ...IM GSM number are displayed The last option All Lines means that all channels are selected and the same SMS is sent via all channels provided that they are in the Login Status b Enter the recipient s phone number GSM c Type the SMS message in the SMS Content box The maximum length of a message is 140 characters for 7 8 bit ASCII code and 70 characters for 16 bit Unicode d Click Send to send out th...

Page 58: ... to prevent damages to the SIM card 2 Disabling a GSM channel temporary Click GSM Channel Shut Down to access the webpage below to shut each GSM module individually Place a check mark to select the desired channel and then click Save to activate the shut down Remove the check mark and then click Save to turn on the channel again The All Channels selection is a short cut to turn on or to shut down ...

Page 59: ...e Number field 3 Enter the call duration in the Duration field When the call duration of an outgoing reaches the time specified it will be terminated automatically 5 4 10 Get Number Get Number enables the GoIP to retrieve the phone number of the SIM card connected Both SMS and USSD methods are supported however the actual procedures in getting the phone number may still vary between carriers Pleas...

Page 60: ...your carrier for retrieving SIM card phone number 5 Carrier sends back an SMS response with the phone number However the CID of the SMS Response must be set so that the GoIP can check the SMS from this CID 6 Set the Text before the SIM phone number so that the GoIP can extract the phone number from the SMS 7 Press to save the configuration If your Carrier does not support SIM card phone number ret...

Page 61: ...he SIM Phone Number 4 Set SMS Service Number the phone number of another GoIP channel 5 Set SMS Content Trigger String for an SMS Reply 6 Set CID of the SMS Response the phone number of another GoIP Channel same as the one set in SMS Service Number 7 Set Text before the SIM Phone Number Reply Content 5 4 11 Backup Restore The device configuration can be backup or restore via this page Click Backup...

Page 62: ...lick OK in the pop up window shown below to confirm this action Click OK to reset the device configuration back to the factory default 5 4 13 Reboot Click Reboot to restart the device Click OK in the pop up window shown below to confirm this action The reboot process will take couple of mins ...

Page 63: ...S command syntax and are not part of command text SMS Message Content Function INFO Sends an SMS response to the sender with the LAN port IP address info RESET password Reset the device configuration back to the factory defaults and then reboot the device password is the password for the administration level reset password REBOOT password Reboot the device password is the password for the administ...

Page 64: ...t in the actual call conversation Example SMS content 8675588228822 Sender s number 861380000000 SIP Server IP 192 168 2 1 SIP Number 20001 The INVITE message sent to the SIP Server is INVITE sip 8675588228822 192 168 2 1 5060 transport udp SIP 2 0 Via SIP 2 0 UDP 192 168 2 237 5060 branch z9hG4bK363969813 From sip 8613800000000 192 168 2 1 5060 user phone tag 65248630 To sip 8675588228822 192 168...

Page 65: ...TER MESSAGE INFO SUBSCRIBE Content Type application sdp Content Length 226 c Mode 3 SIP Message format The To field in the SIP INVITE message contains the phone numbers of both the called and calling parties These two numbers are concatenated by using the asterisk character with the number of the called party in the front The From field contains the SIP number of the line that is associated with t...

Page 66: ...999 192 168 2 1 SIP 2 0 Via SIP 2 0 UDP 192 168 2 162 5060 branch z9hG4bK1967685528 From sip 20001 192 168 2 1 tag 667435795 To sip 3999 192 168 2 1 Call ID 2094144847 192 168 2 162 CSeq 4 MESSAGE Contact sip 20001 192 168 2 162 5060 Max Forwards 30 User Agent Voptech Content Type text plain Content Length 28 8613682626865 075583185700 Please note that the SIP Server side must be programmed to pro...

Page 67: ... Content 13682626800 Hello world SIP MESSAGE Sent from the SIP Server MESSAGE sip 20001 192 168 2 162 5060 SIP 2 0 From sip 3999 192 168 2 89 tag 5031 To sip 20001 192 168 2 1 Call ID 808807EB A8B3 DD11 BBA6 005056C00008 192 168 2 89 CSeq 3 MESSAGE Contact sip 3999 192 168 2 89 max forwards 16 date Tue 18 Nov 2008 06 36 37 GMT user agent SIPPER for 3CX Phone p hint usrloc applied Content Type text...

Page 68: ...he on off pattern defined 0 means infinite p1on is the tone on duration for the first frequency tone ms p1off is the tone off duration for the first frequency tone ms p2on is the tone on duration for the second frequency tone ms p2off is the tone off duration for the second frequency tone ms p3on is the tone on duration for the third frequency tone ms p3off is the tone off duration for the third f...

Page 69: ...rwarded to other GSM numbers Clients in the group until all GSM channels are used up Effectively speaking if there are 40 GSM channels in a group a maximum of 40 concurrent calls can be achieved by just calling the GSM number of the Server channel The diagram below demonstrates this concept with only single channel GoIPs In fact GoIP with multiple channels can also be used Only one Server in a gro...

Page 70: ...ssage Choose this if both SIP Server and SIP terminal support this parameter Example Caller ID number 13800000000 The Remote Party ID parameter is included in the SIP INVITE Message below 2 USD CID as SIP Caller number This parameter specifies the use of GSM Caller ID instead of its SIP number in the INVITE message when making a call Please make sure that the SIP server supports this type of INVIT...

Page 71: ...by the input gain and the output gain respectively An increase in the output gain means that the GSM PSTN party hears a higher audio level An increase in the input gain means that the VoIP party hears a higher audio level Please note that changing these gain settings affects the DTMF tones in the corresponding path as well As a result DTMF tones for phone dialing may not be detected correctly Plea...

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