For small scale applications, to avoid the expense of an SMS gateway provider, you could connect a mobile phone (perhaps a cut down version on a USB device) to the server.

@ Reply
 

There is something called txt2email which is what they might be using. Here is one of the link: http://sms2email.com/site/sms2email.php . You can find more information on this by typing "txt to email" at google.

@ catkin

Agree but what if the destination domain is set to perform reverse lookup. For example: Somehow I manage to put abc@gmail.com as "from" in email address. Now when this email will leave from naukri.com mailserver it will have the headers containing IP address of their mailserver. Now destination domain is xyz.com which perform a reverse lookup for this email address. It sees that this email has arrived from 50.60.70.80 IP address where as gmail mailserver IP address is 100.110.120.130 then it will realize it is a fake email and has been relayed from somewhere else and not from gmail server. Isn't it? I may be wrong but this is what my understanding says.

T3RM1NVT0R:

Thanks for your effort! Before I would see your reply, I had sent an email to a company in India that provides similar services.

Here I found some useful information:


SMPP Access
Each SMS account has access to SMPP service and access is both SMPP 3.3 and 3.4 compliant

We support 2 way communication and return delivery reports with the error or status codes of your messages

You can bind your gateway or application to our SMSC as transceiver or transmitter and receiver

Send Normal Text, Unicode, Binary, Ringtones, pictures, logos, Vcards, Vcalender, Flash, WAP Push, and OTA provisioning along with other formats

Mobile Originated (MO) Virtual number Short code messages and delivery reports for messages sent, are sent to your application using the receive or transciever channel.

The same consideration applies to Nakuri SMS unless they spoof the origin IP.

All:


Thanks for your contribution to the post/question! I contacted some SMS service providers and found that it is their job to handle the SMS flow and forwarding the incoming SMS to us in many ways such as: We can receive the SMS on our number or we can view it on a Web Application (Control Panel) and generate various reports and set Key Words and Sub Key Words; and they can directly send it to our URL that will then handle the data as we would do in case of a normal form data coming via a GET or POST request. But from what demo I got from them, it looks that it would be in the form of a GET data such as given below:

and then we need to handle those two variables/fields as per our requirement as the URL is ours and not theirs.

However, the charges are varied and it seems there is no consistency as Service Provider A would charge about 20 USD / Mo whereas Service Provider B would charge 30 USD/Mo. Besides only one Key Word can be used such as this:

and if we want more Key Words such as:


etc. then the same charges would apply for each of them. However, they are saying that I can add / create Sub-Key-Words for free or without any extra charges such as these ones:

etc. and the first would remain the same for the service to identify that any messages beginning with "FORWARD" is meant to be forwarded to / redirected to my URL as the same Short Code Number would be used by several other people who are taking the service from them.

For a dedicated long code number the charges are almost 10 or 15 times more.