On Wed, 31 Oct 2001, Parag wrote: > MEDIA-GATEWAY-CONTROL DEFINITIONS AUTOMATIC TAGS::= BEGIN > > MegacoMessage ::= SEQUENCE > { > authHeader AuthenticationHeader OPTIONAL, > mess Message > } > AuthenticationHeader ::= SEQUENCE > { > secParmIndex SecurityParmIndex, > seqNum SequenceNum, > ad AuthData > } > > SecurityParmIndex ::= OCTET STRING(SIZE(4)) > > SequenceNum ::= OCTET STRING(SIZE(4)) > > AuthData ::= OCTET STRING (SIZE (12..32)) > > Message ::= SEQUENCE > { version INTEGER(0..99), > -- The version of the protocol defined here is equal to 1. > mId MId, -- Name/address of message originator > messageBody CHOICE > { > messageError ErrorDescriptor, > transactions SEQUENCE OF Transaction > }, > ... > } > > END > > The above ASN.1 partial structure is specified for MEGACO. We are > implementing encoding and decoding in BER without the help of any tool > or compiler. We are stuck with the Tagging issues. Kindly specify the > solution and how the tagging is to be carried out for the above > substructure without the help of any tool or compiler.
Why on Earth would you want to do such a thing? There are a lot of excellent ASN.1 toolkits available, ranging from freeware to industrial strenth tools. See http://asn1.elibel.tm.fr/en/links/index.htm#tools for a list of some of them. Anyway, the module below was generated by using the OSS ASN.1 compiler -list option. Do yourself a favor and use an existing tool; you will get to market faster and with a lot fewer bugs. MEDIA-GATEWAY-CONTROL DEFINITIONS AUTOMATIC TAGS ::= BEGIN MegacoMessage ::= SEQUENCE { authHeader [0] AuthenticationHeader OPTIONAL, mess [1] Message } AuthenticationHeader ::= SEQUENCE { secParmIndex [0] SecurityParmIndex, seqNum [1] SequenceNum, ad [2] AuthData } SecurityParmIndex ::= OCTET STRING (SIZE (4)) SequenceNum ::= OCTET STRING (SIZE (4)) AuthData ::= OCTET STRING (SIZE (12..32)) Message ::= SEQUENCE { version [0] INTEGER (0..99), mId [1] MId, messageBody [2] EXPLICIT CHOICE { messageError [0] ErrorDescriptor, transactions [1] SEQUENCE OF Transaction }, ... } ErrorDescriptor ::= INTEGER Transaction ::= INTEGER MId ::= INTEGER END ------------------------------------------------------------------------- Bancroft Scott Toll Free :1-888-OSS-ASN1 OSS Nokalva International:1-732-302-0750 [EMAIL PROTECTED] Tech Support :1-732-302-9669 x-1 1-732-302-9669 x-200 Fax :1-732-302-0023 http://www.oss.com