If you travel a lot, are you used to unreasonable mobile roaming charges? However, mobile phones are sometimes absolutely necessary-we have to pay for mobile roaming while working overseas or on vacation, because we need to keep in touch with the office and talk to people around the world about the Raspberry Pi.
Holger Leusch, Benjamin Reichel and Karina Hochstein all faced such problems. To make matters worse, Holger often goes to Cambodia, but his German mobile phone provider has not even signed any roaming agreements with Cambodian telecom operators, so he simply cannot continue to use the original mobile phone (number). Cambodia's reluctant call quality, disgusting bandwidth, delays, and disconnections made him unbearable. The reality is that, like us, he needs to keep in touch with the office.
Enter the realm of Raspberry Pi:
Many people are located in places, and might consider buying a gateway based on SIP-GSM. However, GSM gateways are not cheap: Holger research found that a single GSM-side gateway (you definitely need two, one in each of two locations), the price ranges from 200 to 400 euros. If you invest such a high price, how many phone calls can you make? So, the three of them did it themselves, and the final choices included: running RasPBX via Raspberry Pi, Huawei 3G wireless network card, Asterisk ’s Huawei 3G wireless network card driver, and USB mode conversion tool. The full set is worth about 75 Euros.
Holger says:
Now, when someone calls my GSM number in Germany in Europe, first my domestic mobile phone will ring, and after 5 seconds, it will be transferred to my Cambodian mobile phone. As a by-product, from now on, my Cambodian friend can call my Cambodian mobile phone, and eventually make a call or send a text message with my German mobile phone, the call fee is very cheap ...
Spanning more than 10,000 kilometers, the connection quality brought by the 64 kbps Asterisk “SIP trunk†trunking technology between the two gateways is really awesome. The people who talked to me did n’t even notice that I was overseas. It should be noted that Ofcom, the British communications management agency, said that in some countries, the telecommunications laws related to GSM gateways are still vague:
Ofcom recently clarified that according to British law, as long as it is for its own use, it is completely legal for users (whether businesses or ordinary consumers) to purchase, install and use GSM gateways. However, no one is allowed to use GSM gateway equipment to provide communication services to other individuals, organizations, or commercial institutions. Otherwise, regardless of the geographic location of the gateway equipment or the number of end users connected to each gateway, it will be illegal. This "commercial" use ban also applies to mobile network operators (MNOs) and other organizations because the current licenses of mobile operators have not been extended to the installation and use of GSM gateways.
Basically, you can build your own gateway in the UK-but if you try to sell or rent this service, you will be miserable. However, if you want to use this method to save roaming charges, the mobile network operator sometimes takes further action. For example, if the mobile operator suspects that you are using a SIM card for the GSM gateway, the operator may deactivate the card. Therefore, before taking this action, you must carefully study the local regulations.
ofGEEK:
RasPBX is a complete installation tool for Asterisk and FreePBX running on the Raspberry Pi.
PBX (Private Branch Exchange) user-level switch
Asterisk is an open source software VoIP PBX system. It is a pure software implementation solution running in a Linux environment. It is a very full-featured application that provides many telecommunications functions and can turn your x86 machine into a Your own switch can also be used as an enterprise-class commercial switch.
FreePBX is one of the most powerful GUI (web-based) tools for configuring Asterisk. It provides everything a standard traditional telephone system can do, adding a lot of new features. FreePBX was previously called Asterisk Management Portal, which is a standardized implementation of IP phone tool Asterisk, which can provide a web configuration interface and other tools.
Networking Keystone Jacks.China Cat5e Coupler Jack,Keystone Jack Short Body manufacturer, choose the high quality Cat5e Jack Short,Keystone Jack Unshield, etc, included keystone jacks for CAT6A, CAT6, CAT5E, and CAT3
Keystone jacks are snap in modules used to mount low voltage electrical connectors into a keystone wall plate, patch panel, face plate or surface mount box.
Our Keystone Jacks are available in 10 different colors for easy color-coded installations.
RJ45 port editing
1. Origin:
2. The name RJ stands for the registered jack and is the USOC (universal service ordering codes) code of bell system. USOC is a series of registered sockets and their wiring mode, which are developed by bell system to connect the user's equipment to the public network. FCC regulations control the application of this purpose. The FCC (Federal Communications Commission) issued a document on behalf of the U.S. government to specify RJ11.
3. RJ11 is the common name of the connector developed by Western Electric Co. Its shape is defined as a 6-pin connecting device. Originally called wexw, where x means "active", contact or needle. For example, we6w has all six contacts, numbered from 1 to 6. The we4w interface only uses four pins, the outermost two contacts (1 and 6) are not used, and we2w only uses the middle two pins. For RJ11, the information source is contradictory. It can be a 2 or 4-core 6-pin connector. What's more confusing is that RJ11 is not only used to represent the 6-pin connector, it also refers to the 4-pin version.
4. RJ45 and RJ11: different standards, different sizes
5. Due to the different sizes of the two (RJ11 is 4 or 6-pin, RJ45 is an 8-pin connection device), it is obvious that the RJ45 plug cannot be inserted into the RJ11 socket. However, it is physically feasible (RJ11 plug is smaller than RJ45 jack), which makes people think that they should or can work together. It's not. It is strongly recommended not to use RJ11 plug for RJ45 socket.
â’ because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. are not in accordance with the international standard connector design requirements, so interoperability cannot be guaranteed. They even cause damage to both. Since the RJ11 plug is smaller than the RJ45 socket, the plastic parts on both sides of the plug will damage the metal pin of the inserted socket.
RJ - 45 port is our most common port, it is our common twisted pair Ethernet port
Because twisted pair is mainly used as transmission medium in Fast Ethernet, RJ-45 port can be divided into 10Base-T network RJ-45 port and 100base TX network RJ-45 port.
Among them, the RJ-45 port of 10Base-T network is usually identified as "eth" in the router, while the RJ-45 port of 100base TX network is usually marked as "10 / 100btx". This is mainly due to the fact that most products of Fast Ethernet router still adopt 10 / 100Mbps bandwidth adaptive.
The left figure shows the RJ-45 port of 10Base-T network, while the right figure shows the RJ-45 port of 10 / 100base-tx network. In fact, the two RJ-45 ports are exactly the same in terms of the port itself, but the corresponding network circuit structure in the ports is different, so they can not be connected casually.
Definition of RJ45 interface pin signal
Ethernet 10 / 100Base-T interface:
1 TX + tranceive data +
2 TX - tranceive data -
3 RX + receive data +
4 N / C not connected
5 N / C not connected
6 RX - receive data
7 n / C not connected
8 N / C not connected
Ethernet 100base-t4 interface:
1 TX_ D1 + tranceive data +
2 TX_ D1 - tranceive data
3 RX_ D2 + receive data +
4 BI_ D3 + bi directional data +
5 BI_ D3 bi directional data
6 RX_ D2 - receive data
7 BI_ D4 + bi directional data +
8 BI_ D4 bi directional data
Note: RJ45 interface adopts differential transmission mode, TX + and TX - are a pair of twisted pair, which can reduce interference when twisted together.
Cat5e Coupler Jack,Keystone Jack Short Body,Cat5e Jack Short,Keystone Jack Unshield
ShenZhen Antenk Electronics Co,Ltd , https://www.antenkelec.com