megaco_compact_text comparation

Hakan Mattsson <>
Mon Mar 8 12:55:40 CET 2004


Carlos> We are testing the erlang megaco application with a mp-102 analog
Carlos> gateway, but the ServiceChange fails. Find attached a file that
Carlos> contains images of both ServiceChanges: A valid one and one from the
Carlos> mp-102. The difference is visible.

Have you told AudioCodes that their stack does not comply with the standard?

Carlos> How can we fix this in order to be able to receive a valid transaction
Carlos> from the mp-102?, knowing that it always adds the caracters 00 or \x00
Carlos> to the ServiceChange Command. Do we need to hack the erlang's code at
Carlos> the "handled" libraries?

Yes, if you want to be bug compatible with AudioCodes you need to hack a little.

Add the following rule to megaco/src/text/megaco_text_parser.yrl:

  megacoMessage        -> optSep authenticationHeader message safeToken endOfMessage
			      : #'MegacoMessage'{authHeader = '$2', mess = '$3'} .

directly after this rule:

  megacoMessage        -> optSep authenticationHeader message endOfMessage
			      : #'MegacoMessage'{authHeader = '$2', mess = '$3'} .

and recompile the megaco application. This would allow trailing safeChars in
any text message.

/Håkan


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