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"If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas." ...GBS

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30 December 2015
Posted by Jaisal Abdurrahman

gatewaysip.com

The gateway to sip. Best sip gateways


A VoIP gateway is a gateway device that uses Internet Protocols to transmit and receive voice communications (VoIP). The general term is ambiguous and can mean many different things. There are many such devices. They are quickly becoming the most common type of voice phone service in many areas.[citation needed]

Setup

A typical VoIP gateway has interfaces to both IP networks and PSTN (Public switched telephone network) or POTS (Plain old telephone service) telephone services. The gateway may be configured to use these in several ways, including:
  • An internal telephone instrument or PABX, with external connectivity through VoIP via the Internet.
  • The PSTN interface to a telephone network, with IP connectivity to an in-house VoIP phone system.
  • Both PSTN and VoIP interfaces externally, sometimes to offer a connection at local call charges to a remote call centre.
The PSTN interface is often either duplicated as, or can act as, connections for both a foreign exchange station (FXS) and a foreign exchange office (FXO). An FXS interface connects to FXO devices, such as local analogue telephone handsets or the exchange side of a PABX. The FXO interface connects to FXS devices, such as the PSTN.
A relatively potent device is needed to use better compression formats, such as G.729a; a relatively inexpensive and simple device can easily handle a similar function using more bandwidth over G.711. Any device capable of delivering audio in G.711 via Internet in either way can be considered a VOIP Gateway, but one that is capable of sending and receiving simultaneously will perform better. One with support for more codecs will usually be able to perform better in a range of situations, such as restricted bandwidth, though doing so is not always easy to differentiate. The packets of data are quickly sent (as little as a few milliseconds between packets), most often using UDP. A lost packet or two will not usually result in any noticeable degradation of the signal.
Using G.711 as the codec, it is possible to use a fax machine or modem via these devices without issues. This is mostly due to G.711 being a relatively simple compression audio stream. Other codecs will not usually perform this task.
Any modern PC with a microphone and speakers (or a headset serving both those tasks) is capable of acting as a VoIP gateway. This still requires an Internet connection and a SIP relay which adds to the disadvantages of VoIP.[1] Most SIP relays are commercial and charge either pay-per-minute or a flat rate for unlimited service on a number of channels.[citation needed]

https://en.wikipedia.org/wiki/VoIP_gateway

 

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19 April 2012

Site to Site OpenVPN using DD-WRT - Step by step

Posted by Jaisal Abdurrahman

A virtual private network (VPN) is a secure connection between one LAN and another. Think of your router as the middle man between the networks that you’re connecting to.Typically, VPN software and hardware cost a lot  to implement.

OpenVPN is an open-source VPN solution that is free. DD-WRT, with OpenVPN, is a perfect solution for those who want a secured connection between two networks.It is a great tool to connect branches  or easy access your home network from anywhere in the world.Using DD-WRT, you can  configure OpenVPN within minutes.

In newer DD-WRT build,there is no more start up scripts and firewall scripts like old DD-WRT builds.Its much easy to install and configure.Below is the step by step guide to configure OpenVPN over DD-WRT.

This Guide assumes that  you are already familiar with installing DD-WRT on a compatible router . i am not going through.

Here i have used Cisco E2000 with DD-WRT v24-sp2 (04/07/12) vpn - build 18946M as VPN router and Cisco E1000 with DD-WRT v24-sp2 (04/07/12) vpn-small - build 18946M as VPN client.
The reason to have vpn-small build on E1000 is that, its only support 4MB flash.

Network scenario in this guide as below:


Server Side Network:192.168.1.0/24
Client Side Network: 192.168.11.0/24 and 192.168.10.0/24 ( for software OpenVPN Client)
VPN Tunnel Network : 172.16.1.0
E2000 (VPN Server) IP address : 192.168.1.1
E1000 (VPN Client) IP address  : 192.168.11.1
VPN Sever Tunnel IP Address : 172.16.1.1

Firs of all we have to prepare Certificates and Keys using OpenVPN Software.You can download OpenVPN Windows GUI from here and follow this instruction to create Certificates and Keys.

Configuring VPN server Router:

This guide assumes that you have already updated firmware of E2000 to DD-WRT build 18946M.The basic idea now is to copy the server certificates and keys we made earlier and paste them into the DD-WRT OpenVPN Daemon menus. Open your browser and navigate to your router.Go to Servives -VPN and click the Enable radio button under OpenVPN Server/Daemon.


Configure as below.You may change your configuration as per your scenario.





Now we to need our server keys and certificates we created earlier. In Windows Explorer, navigate to C:\Program Files (x86)\OpenVPN\easy-rsa\keys on 64-bit Windows 7 (or C:\Program Files\OpenVPN\easy-rsa\keys on 32-bit Windows 7). Open each corresponding file below (ca.crt, server.crt, server.key, and dh1024.pem) with Notepad and paste the contents in the corresponding boxes as seen below.insert "Additional config" as below and leave all other boxes blank.

  
  
Save and Apply settings.Now go to Administration - Commands and save the below to Start up Script

mkdir -p /tmp/openvpn/ccd
echo "iroute 192.168.11.0 255.255.255.0" > /tmp/openvpn/ccd/"CN of Client1"
echo "iroute 192.168.10.0 255.255.255.0" > /tmp/openvpn/ccd/"CN of Client2"
 
Note that you must change "CN of Client1" and "CN of Client1" to your exact common name without quotes which you are used when creating certificates.

Enter below and Save Firewall  

iptables -t nat -A POSTROUTING -j MASQUERADE

Setting UP OpenVPN Client.


This guide will continue soon  ........

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01 August 2011

Convert SIP trunking to E1 - ISDN PRI or R2 MFC

Posted by Jaisal Abdurrahman

       Saudi Telecom company (STC) started to provide SIP trunking for business customers. Heard that there is no more traditional DID DOD over E1.These services allow callers to make direct inward dialing (DID) or direct outward dialing (DOD) calls without an operator's assistance by connecting company's PBX to STC's exchange. 
        Business customer PBX systems and call centers usually want E1 PRI. The PRI stands for Primary Rate Interface, a term that comes from a set of telecommunication standards called ISDN or Integrated Services Digital Network. What PRI adds to a standard channelized E1 line is a dedicated signaling channel that makes call setup and teardown faster, plus the ability to provide Caller ID and ANI (Automatic Number Identification.) A E1 PRI line gives you 30 channels that can each carry one telephone call plus the data or signaling channel. 
         Many of corporate customers running on TDM PBX having E1 PRI interface which will not support SIP trunking. STC is providing point to point Ethernet (dedicated for voice) to deliver SIP trunking service without authentication.
          VOIP Gateway equipment can act an important part in above scenario. It can convert SIP trunks to Legacy E1 (ISDN PRI/R2 MFC).one equipment can carry up to 4 E1 .And this equipment is now available in Saudi market (contact me on  mail@jaizal.com for details)
Visual scenario as shown below:




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12 April 2010

Fix - Cannot Switch language at login screen

Posted by Jaisal Abdurrahman

Many of laptops are coming now days with Windows 7 English preinstalled.those who are interested to change the interface to local language ,download the language pack files from Microsoft.com
(use Vistalizator if you have Home Basic or Home Premium versions )
How ever, you may face difficulties to type in local language at login screen if you did not setup your language setting properly while installing.follow the instruction below to re enable the language switching at logon screen.

Open Control Panel > Regional and Language Settings and go to Administrative tab























Click on Copy setting  and enable Welcome screen and system accounts



Click Ok and now you can write password in your local language at login screen

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28 November 2009

Jeddah Flood on 25-11-09

Posted by Jaisal Abdurrahman
























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26 November 2009

Eid - Mubarak

Posted by Jaisal Abdurrahman

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27 June 2009

Who is real Ahlu Sunna ? - Abu Mussab Wajdi Akkari

Posted by Jaisal Abdurrahman

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18 May 2009

How to create a blog with Blogger

Posted by Jaisal Abdurrahman

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28 April 2009

Now you can simply Embed pictures to Gmail

Posted by Jaisal Abdurrahman

Now you can simply add an inline image to an email you are composing in Gmail.The following steps are describing how to make it possible.

  • To enable this feature open your Gmail and click on settings then labs


  • Scroll down and enable Inserting images
  • Save your setting and go to compose mail.Now you will see the new image insert tool appeared in your editor.



Please note that this feature is not yet compatible with Firefox browser.

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10 March 2009

Kids protection software !

Posted by Jaisal Abdurrahman

While using a PC children are completely out of the parental control and parents can't actually find out what their children do when they're online. Fencing children from computers or allowing using them only when parents are supervising the process is not an ideal solution. Besides producing a negative impact on relations with you child, this also makes it harder for your offspring to compete with other children, as the Internet these days gives certain social and academic advantages.

However, the Internet content should be filtered, there's absolutely no doubt. Kids protection software is probably the ideal solution in terms of internet protection for kids when parents are not at home.

Here you can download one of the best Kids protection software

Golden Filter Pro 1.1

Installation Instructions





















Credits : http://www.computer-e-technologies.co.uk

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02 November 2008

Padavugal launched on October 2008

Posted by Jaisal Abdurrahman

An E- Magazine published by Indian islahi centre Speakers,Readers & Writers forum lounched on December Last week.from the Propitious feed back , forum planned to publish next edition in very soon.

www.Padavugal.blogspot.com

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06 July 2008

Fix - Cannot open exe files after virus infection

Posted by Jaisal Abdurrahman

You cannot open exe files when your computer infected with w32/sircam or any similar type of virus.when try to open any exe files or any programs , you may get thefollwing type of messages

The system cannot find the file
or Windows cannot file this file select program from a list

the reason is ,virus can change the default configuration for running EXE files. This may lead to failed operation when you try to run EXE files. the following solution will help you to fix the problem after removal of viruses

1- Go to start and click run
2- type command.com and press OK.this will open command prompt.
3- type cd\ and press enter to get root of C drive
4- type cd \windows press enter
5- Type copy regedit.exe regedit.com and then press Enter
6- Navigate to and select the key:
HKEY_CLASSES_ROOT\exefile\shell\open\command
7- In the right pane, double-click the (Default) value.
8- Delete the current value data, and then type:
"%1" %*
Tip: Type the characters: quote-percent-one-quote-space-percent-asterisk.
9- Close Regedit utility and restart your computer.

Now the problem should be solved

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14 June 2008

A handy tool to forward ports in windows PC

Posted by Jaisal Abdurrahman

Analog Port mapper is a free handy tool for port forwarding in windows PC's.As far as i know it is quiet easy to forward ports in linux machine, but in windows xp so difficult to forward a port unless we have enabled ICS .it is usual to think why needed a portforwarding in a particular windows xp machine.I had a situation to make me think about this feature.In one of my network scenario ,remote locations are connected via vpn clinet software .so i can access only the PC which is installed client software in the remote network.ones i needed to acces an IP camera which is connected in remote network,make me think about any ways to reach the IP camera.Bridging VPN adapter with remote network is not a proper solution because of difficulty in DHCP assignment of VPN adapter.
However this handy tool helped me to reach to the IP camera which is in remote network subnet.the tool forwading traffics comming from port 80 of VPN adapter,to the ip address of camera and make it possible to monitor the camera from head office.

Download Port mapper

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10 June 2008

Not Afraid To Stand Alone

Posted by Jaisal Abdurrahman

A nice song from Native deen

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22 April 2008

The Grid: The Next-Gen Internet?

Posted by Jaisal Abdurrahman

AMSTERDAM, Netherlands -- The Matrix may be the future of virtual reality, but researchers say the Grid is the future of collaborative problem-solving.

More than 400 scientists gathered at the Global Grid Forum this week to discuss what may be the Internet's next evolutionary step.

Though distributed computing evokes associations with populist initiatives like SETI@home, where individuals donate their spare computing power to worthy projects, the Grid will link PCs to each other and the scientific community like never before.

The Grid will not only enable sharing of documents and MP3 files, but also connect PCs with sensors, telescopes and tidal-wave simulators.

IBM's Brian Carpenter suggested "computing will become a utility just like any other utility."

Carpenter said, "The Grid will open up ... storage and transaction power in the same way that the Web opened up content." And just as the Internet connects various public and private networks, Cisco Systems' Bob Aiken said, "you're going to have multiple grids, multiple sets of middleware that people are going to choose from to satisfy their applications."

Read More

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14 April 2008

Ana Al'ibadi

Posted by Jaisal Abdurrahman

Anasheed from shiekh Meshary Rashid AL 'Afasi







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13 March 2008

Download internet explorer 8 Beta

Posted by Jaisal Abdurrahman

IE 8 Beta

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18 February 2008

Downgrade Vista to XP on SATA AHCI ebedded Laptops

Posted by Jaisal Abdurrahman

Here I am going to explain how to Downgrade Vista to XP on New Laptops with 960/965/gm965 chipsets and the ALC268 realtek high definition sound card.
The Following method tested in Toshiba A200 PSAE3C and HP dv6500.but it may work with other Toshiba A200 Series and HP dv6000 series also depending on chipset.
First,backup your existing OS and files by creating recovery disks,read your manual for further details.
Download the following files which are needed for Disk Creation process

nLite
Intel SATA Driver
Microsoft High definition hotfix

Slipstream your Windows xp using nLite as follows

1. Copy The Windows XP SP2 cd which you have to a folder named xpsp2
2. download and install Intel SATA Driver
3. Download Microsoft High definition hotfix and extract it using winrar
4. Download and install nLite

Run nlite

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Chose your Winxp folder and click Next
Click Next again until the below screen appear

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Choose Drivers and Bootable cd then Click Next


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Import Single Driver


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Browse C:\Program Files\intel\Intel Matrix Storage Manager\Driver\iastor.inf and click Open

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Select Intel(R) 82801HEM/HBM SATA AHCI Controller (Mobile ICH8M-E/M) then Click OK

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Click Insert again and choose Multiple driver folder

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Browse the Commonfiles Folder which you extracted from High definition hotfix then Click OK


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Select Commonfiles and Click OK
Click Next


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Apply Changes by Clicking YES


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After Processing Click Next


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If you want to Burn it directly to a cd ,select mode Direct Burn and specify a label.
after inserting a blank cd,Click Burn

Now you can use this cd to install Windows XP in your machine






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12 January 2008

Build a Wireless Repeater Bridge

Posted by Jaisal Abdurrahman

To build a network bridge is easy through a Ethernet cable.It is used to connect two LAN segment. Making it trough a wireless link is not easier like Ethernet. The two segments will be in the same subnet and look like two Ethernet switches connected by a cable to all computers on the subnet.wireless bridge will be great idea when we don't want to run an Ethernet cable between two locations.
The following guide is explains building of a wireless repeater bridge using DD-WRT firmware from my experience
the example scenario as follows :-
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Materials used :-

Linksys WRT54G as primary router
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Linksys WAP54G v3 as secondary access point
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DD-WRT v24 Beta (08/15/07) micro Firmware to flash WAP54g

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Flash your WAP54G with DD-WRT v24 Beta (08/15/07) micro firmware

  1. On Secondary(DD-WRT) Router make Restore Factory Defaults
  2. Connect your PC to the secondary router via wired or wireless
  3. Open the Wireless -> Basic Settings tab
    • Wireless Mode : Repeater Bridge
    • Wireless Network Mode : Mixed
    • Wireless Network Name(SSID) : Same as Primary Router
    • Wireless Channel : Auto
    • Wireless SSID Broadcast : Enable
    • Network Configuration : Bridged
    • Save Settings
  4. Virtual Interfaces Section
    • Add
    • Wireless Network Name(SSID) : anything Different from Primary Router
    • Wireless SSID Broadcast : Enable
    • AP Isolation : Disable
    • Network Configuration : Bridged
    • Save Settings
  5. Open the Setup -> Basic Setup tab
    • Connection Type : Disabled
    • IP Address : 192.168.1.2 (Assuming Primary Router IP is 192.168.1.1)
    • Mask : 255.255.255.0
    • Gateway: 192.168.1.1 (IP of your Primary Router)
    • Assign WAN Port to Switch : Checked or Unchecked - your choice
    • Save Settings
  6. Open the Security -> Firewall tab
    • Disable SP1 firewall
    • Save Settings
  7. Open the Status -> Wireless tab
    • Site Survey
    • Join Primary Router
    • Continue
  8. APPLY Settings
Now you can be able to connect internet through the newly configured Secondary router. Clients will receive IP Addresses from the Primary Router.(if DHCP Server Enabled)

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16 December 2007

Vista Control Panel Issue

Posted by Jaisal Abdurrahman

When trying to open Control Panel,its just opened and disappear again before even showing any Icons ,and dis appeares the printers icons also.after several restarts, it works for a while then returns the same problem....
Solution :-

Download and install the following Vista hot fix.


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