MMS decoding problem

[Salman Malik <salmanmk () live com>]

Hi all,

I know this is not directly related to wireshark but I expect that most of you will be able to help me on this one. I 
am using asn1c Compiler to decode MMS protocol (transported over TPKT, COTP,Session, Presentation, ACSE layers). The 
problem that I am having is the asn1c compiler complains of unexpected tag when I decode the MMS layer packets. I 
suspect that this is related to context that needs to be passed from presentation layer onwards. Can someone kindly 
tell me what is a context (I understand that it is used for translating abstract syntax to transfer syntax i.e actual 
bits, I hope I am right in my understanding) , where should I look for it in an MMS  trace ? And how is it transfered 
(between layers) and used by them ?

Any pointers for resolving this problem are much appreciated.
Thanks.



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