Hi,
I'm out sure what you are trying to ask, nor am I familiar with RUA. But the RUA ASN1 code has 
RANAP-Message	::=			OCTET STRING
So of course the RUA dissector calls the RANAP dissector to decode this message, if your implementation puts something else than RANAP data into the
RANAP-Message structure you could add a preference and if the preference is set call your dissector instead.
Regards
Anders
-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Marvin
Sent: den 22 juni 2015 22:31
To: wireshark-dev@xxxxxxxxxxxxx
Subject: [Wireshark-dev] Change RANAP dissector to my own
Hi All:
	I'm developing my own dissector to dissect some special packets, the valuable infos are packed in RUA packet, and wireshark recognize these infos are RANAP packets which are not.
	So i was wondering, can i change the RANAP dissector or i just write a new dissector? But how could the new dissector work in the RUA dissector? I read the source code, it seems that the RUA dissector hard-encode RANAP dissector.
	Thank in advance!
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