Comments on: Text formatting with EMS

By: Alan

Alan — Tue, 01 Jun 2010 14:29:22 +0000

Hi Jeroen,

Do you know if all phones support EMS?
Do you have sample smpp log for a sm submit with ems content?

Thanks in advance for your assistance.

Alan

By: Sunny

Sunny — Wed, 19 Aug 2009 05:07:00 +0000

Hi Jeroen,
Thanks for explaining that up. Let me have a new look at it based on the info you gave.
Also just like your articles on SMS/EMS format, will be great if you start something on MMS encoding as well. Waiting to read about that.
Good Day,
Sunny

By: Jeroen

Jeroen — Tue, 18 Aug 2009 17:17:02 +0000

Hi Sunny,

I am glad you find my posting useful.

Did you check out the article on how to pack GSM-7 characters into 7 bits? The issue you may be running into is that you’re not starting the text on a septet boundary. In my particular example I have a UDH of 27 octets (this is including the octet for the UDHL). These 27 octets take up 216 bits. This uses the space of 31 septets (=217 bits), so I needed to add 1 padding bit.

Jeroen

By: sunny

sunny — Tue, 18 Aug 2009 09:00:22 +0000

Hi Joren,
Thanks for this wonderful posting. One query, I am not able to figure out how you encoded the last 54 data octets i.e. ‘EMS messages can contain italic, bold, large, small and colored text’. I tried to encode it in the way you have said in your SMS PDU article but I get a different translation ‘C5E6…’ not ’8ACD29A…’ as you have mentioned. Am i missing something?

By: osa

osa — Mon, 20 Jul 2009 08:56:19 +0000

Hi Jeroen! It make sense In my calculation I forgot add UDH It was only one octet but… was Thanks a lot!

By: Jeroen

Jeroen — Sun, 19 Jul 2009 21:22:57 +0000

Hi Osa,

The User Data (UD) or payload includes both text and the User Data Header (UDH). Even the single octet that represents the User Data Header Length (UDHL) is part of the payload. It is always confusing to count all of this in septets, since the UDH consists of octets (not septets), but this is the way it is.

The 27 octets (216 bits) for UDHL + UDH occupy 31 septets (217 bits). The next 68 septets (characters) are for the text (which starts on a septet boundary). This makes 99 septets total (= 63 hex).

Does it make sense this way?

Good luck,
Jeroen

By: osa

osa — Sun, 19 Jul 2009 19:48:19 +0000

Hi! Could you explain why UDL is 0×63? This octet is UDL or number of septets (letters) but septets are 69 not 99(dec) = 63(hex). If 0×63 is UDL how to count it? I was trying but alweys counting more or less 99

PS. Great and usefull blog Sorry for my poor english

By: Jeroen

Jeroen — Wed, 10 Jun 2009 02:14:12 +0000

For the text encoding see the article “More on the SMS PDU”. I’ve linked this article for your convenience.
Good luck,
Jeroen

By: Fernando V.

Fernando V. — Wed, 10 Jun 2009 00:35:31 +0000

Hello. In this example,How are the last 54 octets coded?. Did you use the same encoding when you send a normal SMS and when you send an EMS?… Thank you for your response and congratulations for this blog.