Re: ussd protocol stack in kannel

if you find any SMSC which implements this and provide SIM cards to  
test this, it could be implemented.
However this is a very very rare feature. I have not seen any SMSC on  
the market supporting this. I know in THEORY SMPP has some stuff in  
there for USSD but in practice, USSD is very different from SMS as it  
is transactional based, not message based. I think the designers of  
SMPP simply had in mind that the same protocol could be used but to a  
different type of machine, a USSD Service Center (or how ever you want  
to call it). All USSD solutions I have seen so far where directly SS7  
based and attached to the HLR.

On 05.06.2008, at 09:09, Yury.Mikhienko wrote:

> Stipe Tolj wrote:
>> Bambang Sadikin schrieb:
>>> dear All :
>>> has anyone put or starting to put ussd protocol stack in kannel  
>>> software systems ?
>>
>> the USSD subystem as defined by GSM 03.90 spec is "beyond" the IP  
>> layer on which Kannel interacts with the SMSCs of a network. In  
>> fact USSD is more related to the MAP/TCAP signaling layer (ss7),  
>> then on the pure SMSC inter-connection.
>>
>> Some protocols, i.e. SMPP v3.4 allow connecting to USSD gateways  
>> (or other network elements) that provide a SMPP interface to the  
>> USSD string exchange. But this depends on the capabilities of the  
>> SMPP server.
>>
>> There is no standardized IP based protocol to use for USSD gateway  
>> connectivity. So most USSD gateway vendors use their own protocol,  
>> or try to use a well-known, like XML over HTTP (SOAP) or SMPP.
>>
>> Stipe
>  TLV_OCTETS(its_session_info, 2, 2) in PDU submit_sm can provide to  
> hold USSD session
>
>
> -- 
> Best regards,
> Yury Mikhienko.
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