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  Compiling Asterisk Once you've compiled and installed the zaptel and libpri packages (if you need them), you can move on to Asterisk . This section walks you through a standard installation and introduces some of the alternative make arguments that you may find useful. We'll also look at how you can edit the Makefile to optimize the compilation of Asterisk. 3.5.1. Standard Installation Asterisk is compiled with gcc through the use of the GNU make program. Unlike many other programs, there is no need to run a configuration script for Asterisk. To get started compiling Asterisk, simply run the following commands (replace version with your version of Asterisk): # cd /usr/src/asterisk- version # make clean # make # make install # make samples Be aware that compile times will vary between systems. On a current-generation processor, you shouldn't need to wait more than five minutes. At Astricon, someone reported successfully compiling ...

  The IAX protocol was developed by Digium for the purpose of communicating with other Asterisk servers (hence " the Inter-Asterisk eXchange protocol "). IAX is a transport protocol (much like SIP) that uses a single UDP port (4569) for both the channel signaling and Realtime Transport Protocol (RTP) streams. As discussed below, this makes it easier to firewall and more likely to work behind NAT. IAX also has the unique ability to trunk multiple sessions into one dataflow, which can be a tremendous bandwidth advantage when sending a lot of simultaneous channels to a remote box. Trunking allows multiple data streams to be represented with a single datagram header, to lower the overhead associated with individual channels. This helps to lower latency and reduce the processing power and bandwidth required, allowing the protocol to scale much more easily with a large number of active channels between endpoints. 8.2.1.2. Future Since IAX was optimized for voice, it has rece...

 About VoIP Functionality VoIP can facilitate tasks that may be more difficult to achieve using traditional networks: Ability to transmit more than one telephone call down the same broadband-connected telephone line. This can make VoIP a simple way to add an extra telephone line to a home or office.( TE110P Asterisk card is an ISDN PRI E1 card.) Incoming phone calls can be automatically routed to your VoIP phone, regardless of where you are connected to the network. Take your VoIP phone with you on a trip, and wherever you connect to the Internet, you can receive incoming calls. Many VoIP packages include PSTN features that most telcos (telecommunication companies) normally charge extra for, or may be unavailable from your local telco,such as 3-way calling, call forwarding, automatic redial, and caller ID. VoIP can be secure by using existing off the shelf protocols as Secure Real-time Transport Protocol. Most of the difficulties of creating a secure phone over traditional phone li...

           ISDN BRI and ISDN PRI Services   There are two main services associated with ISDN Basic Rate Interface (BRI) and Primary Rate Interface (PRI). Both services consist of multiple channels over which data can be sent (known as B channels) and also include a signaling channel (the D channel). The D channel is used for control and signaling purposes, such as setting and tearing down ISDN call. Referred to as out-of-band signaling, this method ensures that other ISDN calls do not interfere with existing connections, that bandwidth on the B channels is reserved for data only, and ultimately results in quicker call setup and teardown. TE110PE Basic Rate Interface (BRI) ISDN Basic Rate Interface ISDN is made up of two 64 Kbps B channels that are used for sending and receiving data in full duplex, and one 16K D channel for signaling. I...

  The PRI (PRI : Primary Rate Interface) is a telecommunications interface standard used on an ISDN (ISDN: Integrated Services Digital Network) for carrying multiple voice and data transmissions between the network and end users. PRI is the standard for providing telecommunication services to businesses,offices,hotels,schools and home.There are 3 types of PRI.It is based on the E1 is common in Europe,Asia,South America and Australia,while T1 transmission in the US, Canada, and J1 in Japan. The T1 line consists of 23 bearer (B) channels and one data (D) channel for control purposes. The E1 carrier provides 30 B- and one D-channel for a bandwidth of 2.048 Mbit/s. ISDN PRI cards have 1/2/4 E1/T1 ports, with PCI/PCIE interface.They support Asterisk,FreePBX,Issabel,VitalPBX,Dahdi ...  Users can build a VoIP phone PBX ,Asterisk phone system,call center for enterprises,offices,hotels,schools,business,home...

  Issabel Server : Asterisk PBX Issabel is Powered By Asterisk. Issabel is an Open Source Software that brings together IP Communications Services in one place It's a platform that simplifies the management of your business interaction channels, incorporating a Telephone exchange (VoIP) with email, CRM, fax, videoconference, recording, reports and more. And it is free,download it from www.issabel.org All of ChinaRoby's Asterisk cards can wok with Issabel. With Issabel and ChinaRoby's Asterisk cards,users can build an Asterisk IP PBX ,VoIP Phone System,call centre,Issabel server for home / businesses / hotels / schools ...

  Freepbx Server : Asterisk PBX Freepbx is based on Asterisk which is an Open Source Software of phone system. Freepbx is an Open Source Software that brings together IP Communications Services in one place. It's a platform that simplifies the management of your business interaction channels, incorporating a Telephone exchange (VoIP) with email, CRM, fax, videoconference, recording, reports and more. And it is free,download it from www.Freepbx.org All of Asterisk cards (FXS FXO cards and ISDN PRI E1 cards) can wok with Freepbx,that is also an Open Source Software,so,users can edit the code to meet the need. And the features and function is powerful.  With Freepbx and ChinaRoby's Asterisk cards,users can build an Asterisk VoIP PBX ,VoIP Phone System,call centre,Freepbx server for home / businesses / hotels / schools ...