Email Push Service :) smtp+dnotify+Asterisk+... :)

Gabriel Ambuehl gabriel_ambuehl at
Thu Feb 1 09:20:49 CET 2007

On Thursday 01 February 2007 01:14:28 Elliot F. wrote:
> I realize we can't make unsolicited connections to the phone, but I
> would disagree with the "we have to use a persistent connection"
> statement.  The best point that Robert made in his original post was
> that there are out of band methods of alerting the phone that a new
> message is available (call from known number or SMS message.)  As far as
> I know, this is how current "push" email systems work.

Most all phone plans I've ever seen would incur significantly higher costs to 
use out of band signaling as opposed to sending a TCP keep alive (which can 
be <100byte) to the server every now and then... Doubly so for the lucky guys 
with flatrate GPRS.

> My whole point is that maintaining a persistent connection between the
> mobile phone is (in my opinion) not efficient, not as easy, and more
> prone to error than using some sort of out-of-band notification.

It could depend on the plan you have and the frequency you get mail, but at 
0.10E per SMS, I rather send a few bytes over GPRS every now and then than a 
SMS each time you get mail.

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