Help
Version 45 (Adrian Georgescu, 08/20/2014 07:39 am) → Version 46/57 (Adrian Georgescu, 09/06/2014 01:04 pm)
h1. Help for Blink QT for Windows and Linux
Blink allows you to communicate in real time over the Internet. To use Blink you need a SIP account from a SIP service provider. Similar to Same like using an email program, you must configure Blink with the account you have obtained from your service provider. If things do not work the they way you expect, there the reasons can be several reasons. The cause may be located caused mainly by two things, one is Blink software itself, itself and the network connectivity or another one is the communication with the SIP Service Provider. While Blink may not be bug free, based on experience so far most of the problems you encounter when using Blink are related to the network connectivity (packet loss, presence of a broken SIP ALG router) or/and communication with the SIP Service Provider (most provider only support Voice calls). Provider. It is not the end-user who should understand the mechanics about how things work, so the main responsibility of making sure that things work correct falls into the hands of the SIP service provider who must properly setup its SIP infrastructure. To eliminate some possible causes, try to use the built-in accounts provided by Blink, all features are known to be working using these accounts.
infrastructure and support its user base.
For help about Blink Pro/Lite on MacOSX see {{wiki(blinkc, Help_For_Blink_Pro, "Help for Blink Pro" )}}
h2. Features
* Multiple SIP accounts
* Bonjour neighborhood discovery
* SIP server discovery using DNS (NAPTR, SRV, A records lookup)
* Audio calls (Opus, G.722, G.711, Speex, GSM, ilBC codecs)
* Chat sessions (MSRP protocol)
* File Transfer (MSRP protocol)
* Multiparty audio conference (both client and server)
* Multiparty chat conference (MSRP switch client)
* SIMPLE Presence (XCAP, Publish, RLS subscribe)
* Contacts management (XCAP)
* Google contacts integration
* Voicemail notifications
* Call history, recording, redial and hold
* ICE NAT traversal
* sRTP encryption
* Hotplug audio device detection (Windows)
h2. Connectivity Problems
If you encounter connectivity problems like inability to receive incoming calls or failure to make outbound calls, you should obtain the SIP trace logs and contact your SIP Service Provider and ask for the reason.
h3. SIP Trace Logs
SIP Protocol trace can be enabled in menu _Blink -> Preferences -> Logging -> SIP trace_. The location of the trace file is:
* Linux: ~/.blink/logs/sip_trace.txt
* Windows XP: C:\Documents and Settings\Username\Application Data\Blink\logs\sip_trace.txt
* Windows Vista and 7: C:\Users\Username\AppData\Roaming\Blink\logs\sip_trace.txt
h2. Reporting Problems
Go to "Blink Support Forum":http://support.icanblink.com
Please report your OS name and version and Blink version. You can find Blink version in menu _Blink -> About_.
h3. Program Exceptions
On Linux, Blink program exceptions are logged to standard error (if running from a terminal).
On Windows, Blink exceptions are logged to _output.log_, which is located in different places dependin on the Windows version:
* Windows XP: C:\Documents and Settings\Username\Application Data\Blink\logs\output.log
* Windows Vista and 7: C:\Users\Username\AppData\Roaming\Blink\logs\output.log
These files can easily be accessed from the Window -> Logs menu.
h3. Crash Reports
On Linux, in case of a crash, a core file is generated in the user home directory. If no dump is generated, add to the user profile _ulimit -c unlimited_
On Windows XP, crash dump files can be found in the folowing folder: _C:\Documents and Settings\All Users\Application Data\Microsoft\Dr Watson,_ the filenames are called _drwtsn32.log_ and _user.dmp_. The dump file _user.dmp_ can be analyzed with the Windows Debugger. Load the file _user.dmp_ in "Windows Debugger":http://www.microsoft.com/whdc/devtools/debugging/default.mspx and type _!analyze -v_ to obtain a backtrace. Click "here":http://support.microsoft.com/kb/315263 for instructions on how to use the debugger.
h3. Configuration File
Blink accounts and settings are stored in a flat-text configuration file.
It is critical that you do not edit this file manually. If you did and Blink does not start you must delete the file and start all over again. The location of the configuration file is:
* Linux: _~/.blink/logs/config_
* Windows XP: _C:\Documents and Settings\Username\Application Data\Blink\config_
* Windows Vista and 7: _C:\Users\Username\AppData\Roaming\Blink\config_
If you send the configuration file to us for debugging, use a text editor to strip the passwords and Google token.
h2. SIP Accounts
!>BlinkQTScreenshot-Enrollment.jpg!
To use Blink you need a SIP Account. At first start, Blink shows the _Add Account_ wizard that helps you configure the initial SIP Account.
If you do not have a SIP Account, Blink can create one for you using the free service provided by SIP2SIP. For more information about this service visit http://sip2sip.info
If you already have a SIP Account, select this option then enter the SIP address in the form of _user@domain_ and _password_. The SIP registrar of the domain is then automatically located in the DNS.
You may configure Blink to use multiple SIP Accounts. To configure a new SIP Account, go to menu _Blink->Accounts->Add Account_.... The Add Account window shows up and you can repeat the steps described above.
After you have configured an account, you can see the status of the registration in the account list of Main Window window. Solid color means that the account has successfully registered, gray color means that the registration has failed or is in progress.
To edit the properties of existing accounts go to menu _Blink -> Accounts -> Manage accounts_.
h2. Main Interface
Blink presents a _Contacts driven_ interface as the main window. The design allows to locate a Contact then to start an action for it, for example to start an audio call.
Hover the mouse over the GUI elements to see a short description of their function.
!>BlinkQTScreenshot-Contacts.jpg!
h3. SIP Account
You can select the SIP Account used as identity for outbound sessions in the _Accounts drop down box_ presented on the top of the main interface.
h4. Bonjour Account
_Bonjour Account_ is a special type of account that is designed to announce itself and discover other neighbours on the local area network. This account does not require a server or SIP service in order to operate.
Bounjour account can be enabled or disabled in menu _Blink -> Accounts_
h3. Search Bar
The Search bar is used for finding an existing contact or for entering a SIP address or telephone number.
To search for a local contact in Blink's _Contacts List_ or the syncronized _Google Contacts_, type text in the Search Bar. You may select a Contact that matched the typed text or use the typed text as the Contact for the next action.
Use the buttons presented at the bottom of the main window to start a session to the current selected Contact or press on _Add Contact_ to add the typed address to the _Contacts List_.
Pressing enter after antering text in the search bar will start an audio call to that address.
If you have registered a SIP Account with Blink, you can search for SIP addresses of other Blink users in menu _Tools -> Search for people_....
h3. Presence Bar
You can use the elements in this section of the interface to change your presence state.
h3. Panel Switcher
This button can be used to switch between the Contacts and Calls panel.
h3. Contacts List
Contacts are organized into Groups. Groups can be collapsed or expanded by clicking on their left-side triangle.
Right click on a Group or Contact to see all possible actions for each of them.
Clicking on _Return key_ or double-clicking a Contact will start the default session type depending on the preferred media configured for each Contact. The default action is to start an _audio call_.
h4. Google Contacts
!>BlinkQTScreenshot-Google.jpg!
The group named _Google Contacts_ displays addresses synced with the Google gmail service. To enable Google Contacts syncronization, go to menu_ Tools->Enable Google Contacts_. When prompted type in your Google account credentials. You can disable the Google Contacts from the same menu.
h4. Bonjour Neighbours
_Bonjour Neighbours_ appear in the _Contacts List_ as a separate Group. When selecting_ Bonjour_ as the default account,_ Bonjour Neighbours_ group is expanded and moved on top of the Contacts list. When changing back to a regular SIP Account, the groups in the Contacts list reshuffle to their previous positions.
h3. Action Buttons
Use the buttons presented at the bottom of the main window to start a session to the current selected Contact.
h4. Add Contact
!>BlinkQTScreenshot-AddContact.jpg!
You can add a _Contact_ to the _Contacts_ _List_ by clicking on the _<notextile>+</notextile>_ button presented on the bottom left of the main interface. _Add Contact_ "window":http://icanblink.com/screenshots-qt.phtml#add_contact appears. The contacts can be stored either locally on the computer that runs Blink or the storage server for the SIP accounts that have XCAP storage feature enabled.
h4. Edit Contact
You can edit a Contact by right clicking on it and select Edit menu option. _Edit Contact_ "window":http://icanblink.com/screenshots.phtml#add_contact appears. To set the_ Icon for the Contact_, click on the Icon area, a file selection dialog appears. If Subscribe to Presence is enabled and the contact publishes its own icon, the icon is automatically retrieved from the network. If a local icon is selected, it will overwrite the network provided icon.
h4. Silent Button
Use this button to disable the audible ringtones caused by incoming session request.
h2. Alert Panel
!>BlinkQTScreenshot-AlertPanel.jpg!
Incoming session requests bring up the _Alert Panel_. Click on the _Accept Button_ to accept a session request. There are two options for rejecting an incoming session request:
* Click on the _Reject button_. The session is rejected with SIP response code 603 and all other SIP devices registered for the same account stop ringing. Forwarding to voicemail or other destinations, when available in the SIP server is also cancelled. You must use this option to terminate all call processing associated with the request.
* Click on the _Busy button_. Blink sends a 486 code back to the caller and stops ringing, other SIP devices keep ringing and forwarding to other destinations remains active as set in the SIP server. You must use this option when you want to pick up the call at a different location or allow the Server to perform other pre-configured routing decisions.
* Click on the Escape key. Blink stops ringing and does nothing else with regards to SIP signaling. Use this option when you do not want to take any decission about the call but you do not want to be disturbed by the ring tone either.
The currently selected input and output audio devices are showed for incoming audio session requests.
h2. Audio Calls
!>BlinkQTScreenshot-Conference.jpg!
Blink has no traditional telephone dialpad, nor you will need one to interact with it. As computers have physical keyboards displaying a classic 12 key dial-pad is a poor design choice for a modern graphical user interface of a rich communications SIP client.
To start an _Audio Call_, select an existing contact or enter a SIP address or telephone number in the search bar.
Once text is entered in the search bar just press enter to start and audio call to that address.
Once a Contact is selected, click on the _Green Handset_ located at the bottom of the main interface or right click and select _Start Audio call_ from the contextual menu. For each new call an entry is added to the _Calls panel_.
When starting and audio call, the main interface switches from the Contacts list to the Calls panel. You can toggle between the two panels by using the button presented on the top of the main interface. The number of active calls sessions is presented at the bottom of the Contacts list.
To switch between multiple calls just click on another call in the _Calls panel_. When switching to a particular call, the audio stream is connected to the input and output device and all other audio calls are put on hold.
To mute your microphone click on the bottom right microphone icon. To un-mute click it again.
The shortcut key for hold is Control+Space.
The shortcut key for hangup is Control+ESC (Linux only).
The shortcut key for redial is Control+R.
h3. DTMF
Dial tones are used to interact with PBX and IVR systems or legacy PSTN gateways. To send DTMF tones, focus the Audio Call by clicking on it. The current call is already focused if you just started it. What you then type on the keyboard is automatically translated into DTMF tones. Alpha-numeric keys are translated into numeric DTMF keys as they are on a numeric telephone keypad.
h3. Hangup
To hangup, click on the _Red handset_ displayed for each audio call in the right hand side of the Calls panel.
h3. Call Recording
To record an audio call click on the _Black circle_. While recording, the circle will toggle between red and black. Recordings are stored as .wav files in the following locations:
* Linux: ~/.blink/recordings/
* Windows XP: C:\Documents and Settings\Username\Application Data\Blink\recordings\
* Windows Vista and 7: C:\Users\Username\AppData\Roaming\Blink\recordings\
h3. Calling to PSTN
To dial a telephone number, just enter a number in the _Search Bar_ followed by Return key.
When dialing numbers by selecting entries from the Google Contacts it is recommended that you store your numbers in international E.164 format (that is + followed by the number).
If you have created a SIP Account with Blink, you can call to PSTN numbers if you have a positive credit. You can use a Credit Card to add _Credit_ to your account in menu _Tools -> Buy prepaid credit_.... You may request the assignment of a PSTN Caller Id by sending an request to the support email address. Recognized number formats are _<notextile>+</notextile>_ or _00_ followed by the _Country Code_ and then _Subscriber Number_.
If you use another SIP Account than the one provided by Blink, access to the PSTN is subject to the support provided by your SIP service provider. The number format depends as well on the conventions imposed by the SIP service provider in question.
When dialing telephone numbers, you can replace the + prefix or add an optional prefix with your own values by editing the section _Blink -> Accounts -> Manage accounts -> Advanced_.
h3. Audio Conference
Drag and drop audio calls on top of each other to create a Conference or use the button presented at the botton at the _Calls panel_ to start a _Conference_ with all active audio calls.
Add new participants to a Conference by dragging Contacts from the _Contacts list_ onto add the green area highlighed on top of the Contacts list.
Each participant can be muted individually by pressing on the microphone symbol that appears on each conferenced session.
To end an _Audio Conference_ drag the calls out of the conference area or press the _Conference_ button again.
There can be multiple active _Audio Conferences_ at any given time, you can use drag and drop to group calls together in different conferences.
h2. Preferences
!>BlinkQTScreenshot-Preferences.jpg!
To edit Blink general preferences and manage the SIP accounts, open menu Blink -> Preferences.
The Preferences are split in Accounts, Audio, Chat, File Transfer, Alerts, Logging and Advanced. Each SIP account has its own set of properties.
Blink allows you to communicate in real time over the Internet. To use Blink you need a SIP account from a SIP service provider. Similar to Same like using an email program, you must configure Blink with the account you have obtained from your service provider. If things do not work the they way you expect, there the reasons can be several reasons. The cause may be located caused mainly by two things, one is Blink software itself, itself and the network connectivity or another one is the communication with the SIP Service Provider. While Blink may not be bug free, based on experience so far most of the problems you encounter when using Blink are related to the network connectivity (packet loss, presence of a broken SIP ALG router) or/and communication with the SIP Service Provider (most provider only support Voice calls). Provider. It is not the end-user who should understand the mechanics about how things work, so the main responsibility of making sure that things work correct falls into the hands of the SIP service provider who must properly setup its SIP infrastructure. To eliminate some possible causes, try to use the built-in accounts provided by Blink, all features are known to be working using these accounts.
infrastructure and support its user base.
For help about Blink Pro/Lite on MacOSX see {{wiki(blinkc, Help_For_Blink_Pro, "Help for Blink Pro" )}}
h2. Features
* Multiple SIP accounts
* Bonjour neighborhood discovery
* SIP server discovery using DNS (NAPTR, SRV, A records lookup)
* Audio calls (Opus, G.722, G.711, Speex, GSM, ilBC codecs)
* Chat sessions (MSRP protocol)
* File Transfer (MSRP protocol)
* Multiparty audio conference (both client and server)
* Multiparty chat conference (MSRP switch client)
* SIMPLE Presence (XCAP, Publish, RLS subscribe)
* Contacts management (XCAP)
* Google contacts integration
* Voicemail notifications
* Call history, recording, redial and hold
* ICE NAT traversal
* sRTP encryption
* Hotplug audio device detection (Windows)
h2. Connectivity Problems
If you encounter connectivity problems like inability to receive incoming calls or failure to make outbound calls, you should obtain the SIP trace logs and contact your SIP Service Provider and ask for the reason.
h3. SIP Trace Logs
SIP Protocol trace can be enabled in menu _Blink -> Preferences -> Logging -> SIP trace_. The location of the trace file is:
* Linux: ~/.blink/logs/sip_trace.txt
* Windows XP: C:\Documents and Settings\Username\Application Data\Blink\logs\sip_trace.txt
* Windows Vista and 7: C:\Users\Username\AppData\Roaming\Blink\logs\sip_trace.txt
h2. Reporting Problems
Go to "Blink Support Forum":http://support.icanblink.com
Please report your OS name and version and Blink version. You can find Blink version in menu _Blink -> About_.
h3. Program Exceptions
On Linux, Blink program exceptions are logged to standard error (if running from a terminal).
On Windows, Blink exceptions are logged to _output.log_, which is located in different places dependin on the Windows version:
* Windows XP: C:\Documents and Settings\Username\Application Data\Blink\logs\output.log
* Windows Vista and 7: C:\Users\Username\AppData\Roaming\Blink\logs\output.log
These files can easily be accessed from the Window -> Logs menu.
h3. Crash Reports
On Linux, in case of a crash, a core file is generated in the user home directory. If no dump is generated, add to the user profile _ulimit -c unlimited_
On Windows XP, crash dump files can be found in the folowing folder: _C:\Documents and Settings\All Users\Application Data\Microsoft\Dr Watson,_ the filenames are called _drwtsn32.log_ and _user.dmp_. The dump file _user.dmp_ can be analyzed with the Windows Debugger. Load the file _user.dmp_ in "Windows Debugger":http://www.microsoft.com/whdc/devtools/debugging/default.mspx and type _!analyze -v_ to obtain a backtrace. Click "here":http://support.microsoft.com/kb/315263 for instructions on how to use the debugger.
h3. Configuration File
Blink accounts and settings are stored in a flat-text configuration file.
It is critical that you do not edit this file manually. If you did and Blink does not start you must delete the file and start all over again. The location of the configuration file is:
* Linux: _~/.blink/logs/config_
* Windows XP: _C:\Documents and Settings\Username\Application Data\Blink\config_
* Windows Vista and 7: _C:\Users\Username\AppData\Roaming\Blink\config_
If you send the configuration file to us for debugging, use a text editor to strip the passwords and Google token.
h2. SIP Accounts
!>BlinkQTScreenshot-Enrollment.jpg!
To use Blink you need a SIP Account. At first start, Blink shows the _Add Account_ wizard that helps you configure the initial SIP Account.
If you do not have a SIP Account, Blink can create one for you using the free service provided by SIP2SIP. For more information about this service visit http://sip2sip.info
If you already have a SIP Account, select this option then enter the SIP address in the form of _user@domain_ and _password_. The SIP registrar of the domain is then automatically located in the DNS.
You may configure Blink to use multiple SIP Accounts. To configure a new SIP Account, go to menu _Blink->Accounts->Add Account_.... The Add Account window shows up and you can repeat the steps described above.
After you have configured an account, you can see the status of the registration in the account list of Main Window window. Solid color means that the account has successfully registered, gray color means that the registration has failed or is in progress.
To edit the properties of existing accounts go to menu _Blink -> Accounts -> Manage accounts_.
h2. Main Interface
Blink presents a _Contacts driven_ interface as the main window. The design allows to locate a Contact then to start an action for it, for example to start an audio call.
Hover the mouse over the GUI elements to see a short description of their function.
!>BlinkQTScreenshot-Contacts.jpg!
h3. SIP Account
You can select the SIP Account used as identity for outbound sessions in the _Accounts drop down box_ presented on the top of the main interface.
h4. Bonjour Account
_Bonjour Account_ is a special type of account that is designed to announce itself and discover other neighbours on the local area network. This account does not require a server or SIP service in order to operate.
Bounjour account can be enabled or disabled in menu _Blink -> Accounts_
h3. Search Bar
The Search bar is used for finding an existing contact or for entering a SIP address or telephone number.
To search for a local contact in Blink's _Contacts List_ or the syncronized _Google Contacts_, type text in the Search Bar. You may select a Contact that matched the typed text or use the typed text as the Contact for the next action.
Use the buttons presented at the bottom of the main window to start a session to the current selected Contact or press on _Add Contact_ to add the typed address to the _Contacts List_.
Pressing enter after antering text in the search bar will start an audio call to that address.
If you have registered a SIP Account with Blink, you can search for SIP addresses of other Blink users in menu _Tools -> Search for people_....
h3. Presence Bar
You can use the elements in this section of the interface to change your presence state.
h3. Panel Switcher
This button can be used to switch between the Contacts and Calls panel.
h3. Contacts List
Contacts are organized into Groups. Groups can be collapsed or expanded by clicking on their left-side triangle.
Right click on a Group or Contact to see all possible actions for each of them.
Clicking on _Return key_ or double-clicking a Contact will start the default session type depending on the preferred media configured for each Contact. The default action is to start an _audio call_.
h4. Google Contacts
!>BlinkQTScreenshot-Google.jpg!
The group named _Google Contacts_ displays addresses synced with the Google gmail service. To enable Google Contacts syncronization, go to menu_ Tools->Enable Google Contacts_. When prompted type in your Google account credentials. You can disable the Google Contacts from the same menu.
h4. Bonjour Neighbours
_Bonjour Neighbours_ appear in the _Contacts List_ as a separate Group. When selecting_ Bonjour_ as the default account,_ Bonjour Neighbours_ group is expanded and moved on top of the Contacts list. When changing back to a regular SIP Account, the groups in the Contacts list reshuffle to their previous positions.
h3. Action Buttons
Use the buttons presented at the bottom of the main window to start a session to the current selected Contact.
h4. Add Contact
!>BlinkQTScreenshot-AddContact.jpg!
You can add a _Contact_ to the _Contacts_ _List_ by clicking on the _<notextile>+</notextile>_ button presented on the bottom left of the main interface. _Add Contact_ "window":http://icanblink.com/screenshots-qt.phtml#add_contact appears. The contacts can be stored either locally on the computer that runs Blink or the storage server for the SIP accounts that have XCAP storage feature enabled.
h4. Edit Contact
You can edit a Contact by right clicking on it and select Edit menu option. _Edit Contact_ "window":http://icanblink.com/screenshots.phtml#add_contact appears. To set the_ Icon for the Contact_, click on the Icon area, a file selection dialog appears. If Subscribe to Presence is enabled and the contact publishes its own icon, the icon is automatically retrieved from the network. If a local icon is selected, it will overwrite the network provided icon.
h4. Silent Button
Use this button to disable the audible ringtones caused by incoming session request.
h2. Alert Panel
!>BlinkQTScreenshot-AlertPanel.jpg!
Incoming session requests bring up the _Alert Panel_. Click on the _Accept Button_ to accept a session request. There are two options for rejecting an incoming session request:
* Click on the _Reject button_. The session is rejected with SIP response code 603 and all other SIP devices registered for the same account stop ringing. Forwarding to voicemail or other destinations, when available in the SIP server is also cancelled. You must use this option to terminate all call processing associated with the request.
* Click on the _Busy button_. Blink sends a 486 code back to the caller and stops ringing, other SIP devices keep ringing and forwarding to other destinations remains active as set in the SIP server. You must use this option when you want to pick up the call at a different location or allow the Server to perform other pre-configured routing decisions.
* Click on the Escape key. Blink stops ringing and does nothing else with regards to SIP signaling. Use this option when you do not want to take any decission about the call but you do not want to be disturbed by the ring tone either.
The currently selected input and output audio devices are showed for incoming audio session requests.
h2. Audio Calls
!>BlinkQTScreenshot-Conference.jpg!
Blink has no traditional telephone dialpad, nor you will need one to interact with it. As computers have physical keyboards displaying a classic 12 key dial-pad is a poor design choice for a modern graphical user interface of a rich communications SIP client.
To start an _Audio Call_, select an existing contact or enter a SIP address or telephone number in the search bar.
Once text is entered in the search bar just press enter to start and audio call to that address.
Once a Contact is selected, click on the _Green Handset_ located at the bottom of the main interface or right click and select _Start Audio call_ from the contextual menu. For each new call an entry is added to the _Calls panel_.
When starting and audio call, the main interface switches from the Contacts list to the Calls panel. You can toggle between the two panels by using the button presented on the top of the main interface. The number of active calls sessions is presented at the bottom of the Contacts list.
To switch between multiple calls just click on another call in the _Calls panel_. When switching to a particular call, the audio stream is connected to the input and output device and all other audio calls are put on hold.
To mute your microphone click on the bottom right microphone icon. To un-mute click it again.
The shortcut key for hold is Control+Space.
The shortcut key for hangup is Control+ESC (Linux only).
The shortcut key for redial is Control+R.
h3. DTMF
Dial tones are used to interact with PBX and IVR systems or legacy PSTN gateways. To send DTMF tones, focus the Audio Call by clicking on it. The current call is already focused if you just started it. What you then type on the keyboard is automatically translated into DTMF tones. Alpha-numeric keys are translated into numeric DTMF keys as they are on a numeric telephone keypad.
h3. Hangup
To hangup, click on the _Red handset_ displayed for each audio call in the right hand side of the Calls panel.
h3. Call Recording
To record an audio call click on the _Black circle_. While recording, the circle will toggle between red and black. Recordings are stored as .wav files in the following locations:
* Linux: ~/.blink/recordings/
* Windows XP: C:\Documents and Settings\Username\Application Data\Blink\recordings\
* Windows Vista and 7: C:\Users\Username\AppData\Roaming\Blink\recordings\
h3. Calling to PSTN
To dial a telephone number, just enter a number in the _Search Bar_ followed by Return key.
When dialing numbers by selecting entries from the Google Contacts it is recommended that you store your numbers in international E.164 format (that is + followed by the number).
If you have created a SIP Account with Blink, you can call to PSTN numbers if you have a positive credit. You can use a Credit Card to add _Credit_ to your account in menu _Tools -> Buy prepaid credit_.... You may request the assignment of a PSTN Caller Id by sending an request to the support email address. Recognized number formats are _<notextile>+</notextile>_ or _00_ followed by the _Country Code_ and then _Subscriber Number_.
If you use another SIP Account than the one provided by Blink, access to the PSTN is subject to the support provided by your SIP service provider. The number format depends as well on the conventions imposed by the SIP service provider in question.
When dialing telephone numbers, you can replace the + prefix or add an optional prefix with your own values by editing the section _Blink -> Accounts -> Manage accounts -> Advanced_.
h3. Audio Conference
Drag and drop audio calls on top of each other to create a Conference or use the button presented at the botton at the _Calls panel_ to start a _Conference_ with all active audio calls.
Add new participants to a Conference by dragging Contacts from the _Contacts list_ onto add the green area highlighed on top of the Contacts list.
Each participant can be muted individually by pressing on the microphone symbol that appears on each conferenced session.
To end an _Audio Conference_ drag the calls out of the conference area or press the _Conference_ button again.
There can be multiple active _Audio Conferences_ at any given time, you can use drag and drop to group calls together in different conferences.
h2. Preferences
!>BlinkQTScreenshot-Preferences.jpg!
To edit Blink general preferences and manage the SIP accounts, open menu Blink -> Preferences.
The Preferences are split in Accounts, Audio, Chat, File Transfer, Alerts, Logging and Advanced. Each SIP account has its own set of properties.