["Anders Broman" <a.broman@xxxxxxxxx>]

Hi,

It’s a long time since I worked with SCCP but as I remember ( for IN services at least)

A certain SSN number is used for a specific service between two exchanges or in a network.

 Hence a preference might be the thing to use. e.g in a capture from a specific place the SSN is known ?

Best regards

Anders

>The SSN is only available with the SCCP Connection Request and is required

>to know what type the payload is.  There is only one SSN for a connection.

>I was trying to say that if the SCCP CR is for SSN=142 then we know what

>dissector is required for the payload (RANAP).  Any subsequent SCCP messages

>in the connection will also contain a RANAP payload (if any) and I am

>assuming that means for the conversation.

 

>For example SSN=142 would imply RANAP, SSN=252 would imply IOS, SSN=254

>could be GSM BSSAP or IS-634 or IOS.

 

>I suppose you could rely on heuristics but I have found that doesn't work

>all of the time.