Sriharsha Vedurmudi wrote:
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1. Appending a at the end of the command. Did not use it since its mention was not made in any document that I refered. But, I shall implement it anyway the first thing in the morning and let you guys know. (I believe it would solve the problem)


Try this:

connect your modem to your pc and start hyperterminal.

Type ATDT123456

What happens?
"Nothing" you say...
Now that is correct...
Press <ENTER>.
What happens now?
"It dials" you say...
What do you think happened when you pressed the <ENTER> key?

Think also of the following: How on earth would your modem now that your command is finished? (If it wasn't for the terminating <CR>)...

Also check out following result of a search on google with "AT-command set":

The first site that comes up has (my emphasis):


"The modem will acknowledge most commands almost immediately. As soon as you type in a command ending with the carriage return character your modem will respond with OK."

(http://www.modem.com/glossary/extend1c.html)



Don't believe that this will solve your problem. Believing is OK for religious matters, not for microcontrollers. Any of the posters here can have a valid point. Only testing will tell you were the problems is.



regards


Patrick