Is there a way to create a sip network with multiple telephone numbers and just one public telephone? Do I need to have a sip server for this? Can someone give me some ideas? If I need a sip sever how can I create one? I am new to this stuff.
Thanks.
Creating a SIP server will be rather difficult if you're new to it.
A better way to familiarize yourself with SIP may be to get yourself an old computer and install something like asterisk, or Trixbox community-edition, then work on developing a sip softphone.
The asterisk/trixbox server will then take care of all of your telephone extensions and incoming trunks (I recommend sipgate for incoming trunks, free with 15 simultaneous incoming calls).
There are a lot of open-source sip softphones knocking about, as well as some free .NET sip libraries that you can work with, some of which are discussed here. This will at least help in becoming more familiar with the SIP protocol.
I know this is probably not the answer you were looking for, but I do hope it helps.
If you mean can you have mutliple SIP devices (softphones, ATAs IP Phones etc) all sharing a single PSTN number then the answer is yes. Almost all SIP/VoIP Providers allow you to forward calls from an attached DID (telephone number) to more than one SIP device so your request could be satisfied by a basic account on your friendly neighbourhood VoIP Provider.
Since you included the C# tag you maybe interested in looking at sipsorcery.com which is a project I run and which is based around an open source C# SIP stack.
Related
I am attempting to make a chat application on the .NET framework that will be able to communicate over the internet and not just LAN. I would like it to be P2P as to not require a central server. I don't mind which protocol it uses (UDP, TCP, etc) so long as I can send messages to almost any given IP.
All I would like to know is how to send data to another IP I know of, nothing else. I've searched around but the code is too complicated for me. (For example I've looked at the source code for torrent clients).
Help will be appreciated a lot thanks.
P.S.: I've heard about a method called UDP hole-punching if that sparks any plugs.
There is a small issue with your plan.
The server-centric approach does not serve only as a slow middle man, but also as a central point with known address to connect to, an anchor in the sea to attach to and clients connect to the static IP/name of the server.
Usually, users do not care what is their IP address on the internet...
So at the minimum, the server is good to get list of clients.
Nowadays you can use some services from Microsoft or Google or other.
Now rest of the P2P communication of clients between NAT comes with more learning: TCP_hole_punching
I would suggest reading all that stuff then look for some code or library that does it.
Here is older topic similar to yours looking for the hole punching library: tcp hole punching library
I have answered similar kind of things here Peer-to-Peer application using java, let me know if it helps or if you have any specific question about this. Basically you need NAT traversal, so you would find many different ways to achieve this based on your need. Even you can achieve this simply configuring your router by enabling UPnP.
I am trying to make an online game application, which communicates with another pc peer-to-peer over the Internet.
Since both pc's are likely to be under NAT, and since I cannot afford an external server, I thought the only way is to use free STUN and TURN server, such as Numb.
However, after some research, I couldn't figure out how to use those servers to make a connection.
Is it really possible to use only those servers to do it? If it is, how would you do that?
Or is there an easier way of doing that?
I can use either UDP or TCP for this.
Take a look at the Internet Gateway Device Protocol. Is is an extension to the UPNP protocol, is very easy to use, is supported by pretty much every router out there and there are some free libs implementing this protocol.
I want to develop a program in c# that can target and application or port's traffic and tries to view that traffic.For example,I select example.exe program in my application and it gives me it's network traffic data.
Is it possible?If so,give me some directions.
I'm trying not to use airPcap or winPcap or anything like these,because these libraries target the network card and I don't know what type of interface card the user might be using.
You have to either capture packets where you receive a duplicate from the NIC (pcap), or route requests through your own application so you can inspect the live packet flow (proxy-like).
For a WinPcap implementation in C#, take a look at SharpPcap. For a proxy, see here.
winPcap is a very good library for what you want to do.
If you choose to do it yourself, you will only be reinventing the wheel, and might not be able to support as many network cards as it does.
If you only want to see the traffic, you would have to use a proxy in between.
But I believe you are not looking to build something like, fiddler for example,
that sits in between and allows you to monitor the traffic.
If I understand you correctly you want make a c# app where you select from a list of running applications and display the network traffic to/from that app. You could do this with c# but you would have to make calls to the Windows API to get the information you need. In addition you will need non-c# library for packet capture sucgh as WinPcap. Windows has a new NetMon API that does pcap like things. I have not used it, but you probably way better off with pcap and the SharpPcap lib that CodeCaster posted.
Im sorry if this been asked before, but couldnt find anything about this particular matter.
I try to find out with which of my own ip's my computer use to connect to a remote ip.
I use some kind of socket setup both ways etc, and im sending my ip (and other stuff with xml) to another server so it knows how to contact me.
But how do i figure out which ip i should send to it?
I have the servers ip or host name, but trying with
Dns.GetHostEntry("host").AddressList
But that only gives me the ip of the remote host and not how my computer reach it.
Is my question solveable at all or is this just wishful thinking?
Can you have the remote host capture that data? That end would surely have it.
If you're using UDP then this is exactly what the STUN protocol was designed for. STUN is used in VOIP applications (among other P2P systems) to be able to tell what a specific connection looks like on the internet.
One very reliable .NET implementation that implements STUN is included in the Lumisoft.NET library (source code available here). I've used it myself for to satisfy this specific task for applications ranging from VOIP to P2P VPN alternatives. It is very easy to use and is standards compliant.
NOTE: I am NOT in any way affiliated with Lumisoft, I've merely used their library in several different applications
Ok, quick update that wont help anyone except myself.
But.
Found out that i can send hostname instead of actual ip, will work for now and most cases, and let the DNS do what its suppose to do :)
I want to write an app that sends an SMS to users, and when the recipients texts back, I receive that response, including the originating phone number, and my program can react to that response.
I've googled "Interactive SMS" but didn't find anything that was clearly a fit. Has anyone else done this, got any recommendations for a paid service that provides this kind of functionality?
Alternatively, do you have any other recommendations for how to build this service into my app, which will probably be written in C#?
Find an SMS service provider that gives you an API you can use (e.g. an HTTP API). Then read their documentation.
You need to learn about SMPP (short message peer to peer) protocol. Is the protocol usually used to communicate with carrier's SMSC (Short Message Service Center). Here's a blog entry summarizing the actual status of some C# SMPP libraries. If you don't want to use an existing .NET library, you can always write your own. SMPP is not a very complex protocol after all.
An alternative might be attach your application to a cell phone, and if that cell phone provides you with an API, use it to send and receive texts. The problem here is that it won't scale if your application expects to send and receive hundreds of thousands of text messages per day.
Yet another alternative will be to use a CARRIER AGGREGATOR company that provides you with an API for your application. There are some out there, but I don't know if they will be able to offer you a short code and the possibility to receive texts in your application. Depending on the market you are targeting, you should do a little bit of research on how other VAS companies do it over there.
You can use the TextMarks API for this. It's REST-based and super simple to use. So simple that Harvard uses it to teach new students how to use APIs. Docs here.
Messages routed to you from a user are called MO messages (Mobile Originated) and most 3rd party SMS gateways implement simple api's whereby they will simply HTTP post you incoming messages (including the originators msisdn and home network).
For example http://www.clickatell.com/products/two_way.php
Search the site for SMS Gateways for others.
Check SMS Studio - guys have done a lot on that subject and maybe you can use of-the-shelve software or customize it a little to suit your needs.
If not, at least you can find some good keywords for googling.
Anyway, you will have a choice - either go with SMS gateway, or for low volume SMS traffic, you can go with GSM Modem and handle it manually, though it's not recommended.