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I'm looking at WebRTC and I'm wondering how to implement a solution where the client connects to the PTSN via SIP. It seems like a pretty new technology so I assume that this would not work on IE browsers; is this correct?
Basically, I have a dialpad UI on the page and users who have an SIP account. Can WebRTC enable the end-user to make calls to the PTSN and what does it take to implement such solution?
I'm looking into this as an alternative to Java or Flash based webphones.
Thanks for your suggestions.
WebRTC is indeed new and isn't available on IE or Safari. It is available in beta/alpha on other browsers. IE will probably support it in the future and Safari probably won't for some time.
WebRTC does only the media parts of the negotiation, and as such it means that it does no signaling of its own. SIP can work well with WebRTC, but you will need a JS implementation of SIP (over WebSockets) and then you'll need to unwrap the SIP signaling on the server side and "migrate" it to UDP or TCP.
Asterisk are working on such a server side platform: http://blogs.digium.com/2012/05/23/asterisk-11-webrtc/
More about doing SIP in conjunction with WebRTC can be found here: http://bloggeek.me/html-sip/
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Why can not we send an email using HTTP protocols? An email contains text, so why cant it be send using HTTP?. I searched in every where. But can not understand those documents.So please help me to understand this
The protocols to transfer mails (SMTP, POP, IMAP) are all built on top of TCP and HTTP it built on top of TCP too. At least SMTP and POP are older protocols than HTTP.
Of course you could in theory built some mail transfer protocol on top of HTTP. But this effectively means to rebuilt the functionality we already have on top of TCP so that it now is built on top of HTTP which is on top of TCP again. So this is mostly another layer of complexity without actually gaining a lot.
But I'm pretty sure that they were already several attempts to built SOAP, REST,... API's which care about mail transport. But probably none of this showed to be significantly better than the old protocols we already have, which means that we don't switch the existing infrastructure we have to a new protocol in the foreseeable future. It's not that the existing protocols are that good but to take the effort to replace all of this a new protocol must be significantly better.
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I want to know the different options which are available in iOS to communicate between one to many devices.
For example, one iPhone or iPad acts as server and sends instructions to more than 100 iPads or iPhones.
Can I get some ideas or suggestions on this?
You can use TCP or UDP over a local WLAN.
It is quite easy. To discover the "Server"-device create a Bonjour Service on this device and search for the service with the client-devices
You can then retrieve the IP Address of the device and start communication.
This is the fastest and easiest solution. It has just one requirement, all Devices need to be in the same WLAN.
The additional bonus is that this layout is accessible for all devices having WLAN. So also Android, computers and all the other stuff available.
An optional way would be to do this over a dedicated server backend.
And every device keeps a opened stream to this server to get realtime updates.
Then you don't have the requirement that every device needs to be in the same WLAN. It could also access the Server via mobile network or whatever.
Bluetooth is no option because there are too many devices you want to handle.
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I want to create a chatting application that enable users that connect via XMPP to chat with another users that connect using web socket (perhaps using Netty or Jetty) or vice versa. So every users that connect using web application can chat with other user that connect using web socket.
I am not sure that websocket currently have a default standard that enable it to communicate with other protocols. Let me know your opinion and suggestion.
Very much like on top of TCP, you can implement rich business protocols over WebSockets as well. Kaazing offers XMPP as one of several protocols over WebSockets (in addition to JMS and AMQP).
You can check out the XMPP edition of the Kaazing WebSocket Gateway here, and find the documentation and tutorials here. The developer version of the product, up to 50 concurrent connections, is a free download. The community edition is open-source licensed under the Apache 2.0 license.
There exists a draft for XMPP over WebSockets. It's a year since it was submitted, but I think work on it will continue once WS itself stabilizes.
There exists experimental implementations of XMPP over WS, but since WS has been a moving target, they aren't implementing the latest versions (AFAIK).
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Is there a library or any way to embed video chat capability in a ios application ?
I work at 2600hz, I'm new to stack overflow so if I'm screwing something up, let me know.
You can use Kazoo, our fully open-source cloud voip stack for this, our APIs allow you do all the sip signaling and proxying for Facetime style video connections (we do this for audio calls now, and video works in our lab but we haven't rolled it out to our community yet. Basically you'd need to do some QA).
If you'd like to play with it, I can send you an invite to our hosted cluster OR you can install it directly from our Git repos here: https://github.com/2600hz/kazoo
Yes, there are a few solutions:
First of all, no API from Apple.
Second, OpenTok does seem to solve your problem, Client & Server side easily.
If you want to implement it yourself, I know Spirit & Vidyo, which are paid VoIP & Video stacks.
You may also use iDoubs, or PJSip, both are open-source solutions, but they are using x264 encoder which its license is GPL and not good enough for the AppStore.
Either way, you'll need a 3rd party library for that & you must have a server side as well (Probably a SIP server).
If anyone knows more open-source / paid solutions, please share.
Build Video Chat Into Your Mobile Apps with OpenTok
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I am working on an XMPP client, using ejabberd as server.
My question is how can I support offline file transferring?
I only want to do the offline file transferring for image files.
For example,
I can transfer an image to John even if he is offline.
When John comes back online,
the server will send him the image.
How can I do that?
There is currently no extension for XMPP to allow offline file transfers.
Presumably this would need to be supported by the recipient's server, and it would need to be implemented as a server-specific plugin.
Alternatively a project that may be of interest to you is Jabber Disk, which allows you to upload a file via XMPP, and then returns a HTTP URL you can send to people (for example as an offline message).
XMPP had an extension for this - XEP-0129: WebDAV File Transfers - but it is deferred!
I am searching for the same solution. I came across it, but did not find a XMPP server still supporting it.
Still searching for a solution.
We implemented offline file transfer is TextOne mobile client, but we had to do a custom module. There is no good specification for that yet.
However, for a simple need as you have, I think you could implement it purely client side (uploading to an HTTP server) and use XMPP for signaling.