PDU for sending with AT commands in GSM modems. | Search |
NowSMS Support Forums ⬆ NowSMS Support - SMS Issues ⬆ Archive through March 09, 2004 ⬆ |
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Author | Message | |||
Shrirang Khare New member Username: Shrirang Post Number: 1 Registered: 12-2003 |
Hi , In some GSM modems we need to specify a 00 in beginning of the PDU to tell the modem, that pick the SMSC address from the phone. Now the question is should this 00 contribute to the TPDU length? for example :--- cmgs=16 0035010C9119892255100300000B02E834 Here 16 is the length of the TPDU excluding the preceding 00 now this length can be 17 or 16. For some devices the length of preceding 00 is required and in others its not} Why does this happen ? Thanx in Advance Shrirang. | |||
Bryce Norwood - NowSMS Support Board Administrator Username: Bryce Post Number: 2007 Registered: 10-2002 |
ETSI GSM 07.05, in its definition of the +CMGS command in PDU mode, Section 4.3, states:
I have not encountered any modems that expected the length to include the SMSC address parameter, but that is not to say that there are not GSM modems out on the market that did not implement this feature correctly. (Hopefully there are firmware updates available for any modems that have this bug.) -bn |