[Asterisk-Users] SMS Service over SIP/IAX/h323/MCGP

[Markku Korpi]

The problem I have had with many SMS email gateways, is that they do not
allow to reply back. Of course, email is a superior service over SMS, but
does not really replace it ( - at least not until all the mobile phones have
email access on them...).

It would be nice if the SMS service would be available not only on
GSM/GPRS/etc., but also on any telephone number in the world  - or at least
on every * number... ;-).
(...including confirmation that the message was delivered).

Since SMS is an application it should work over different signaling
protocols in the same way. Then the user should not need to know what kind
of device the other end is using in order to send an SMS and to receive SMSs
back. 

Therefore, in my opinion, if an SMS type of service is to be implemented
over SIP/IAX/h323/MCGP it should follow the appropriate GSM procedures quite
closely, in order to make the interworking as easy as possible. 

There is a fresh draft of SMS for H.323.
You can find it under http://standard.pictel.com/ftp/avc-site/0305_Gen/ with
name  H.450.sms_Draft_8May2003.zip
As any of the H.450 features, it is very straightforward to implement... ;-)

True, the above specification happens to use the ASN.1 coding (since it is
for H.323), but it would be a simple change to carry the same procedures
(including confirmations, etc.) over other types of messages and information
elements/presentations, e.g. over IAX or SIP. 

The MGCP (or Megaco/H.248) implementation would not need SMS specific
implementation, I think, because the * would terminate the SMS procedures
and use the MGCP display/key/softkey primitives to implement a user
interface on an MGCP compliant phone.

--Markku


-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Gary
Sent: Saturday, May 24, 2003 7:21 PM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] advantages of a sip phone over Wildcard
TDM400P solution


On Sat, 24 May 2003 10:13:31 -0700 (PDT), Brett Schwarz wrote:

>
>--- Andy Powell <andy at beagles-den.demon.co.uk> wrote:
>> 
>> I'm not sure if SMS is used in the US (please
>> correct me if I'm wrong)..
>
>Yes, for the last several years...
>
>> however, since SIP does support messaging it would
>> be nice to see
>> that added. 
>> 
>> Andy
>> 
>> On 25/05/2003 at 02:26 Gary wrote:
>> 
>> >just glancing over that panasonic doc made me start
>> thinking, that text
>> >messaging (SMS) with asterisk would be
>> interesting....
>> >
>> >now for IAX/SIP/h323/MCGP is there anything in the
>> specs about SMS
>> >(Short Message Service) which Asterisk could
>> implement ?
>
>
>Are you talking about connecting to the mobile SMS
>systems, or are you talking about having a SMS type
>system for Asterisk?
>
>For the former, the easiest way to do this is to just
>connect via an email hub. Most operators have
>email-SMS gateways, where you can send email to
>mobiles, which gets converted to SMS messages.
>
>For the latter, I believe Asterisk might have some
>type of facility already. In phonecore, there is a
>send text function, which would lead me to believe
>that this was some sort of messaging
>mechanism...although I have not tried it, so I can't
>say for sure.
>
>    --brett

Actually thats whats prompted the thought, never tried it, never even
investigated it, but if it was to work with asterisk via an email
system and a combination of SIP/IAX/h323/MCGP clients support messaging
it would be a rather unique item, mind you it could also be an abused
item, AND email it probably a better alternative anyway (when you think
about it),
.



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