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Borjan Jovanovski jovanovskiborjan at gmail.comDear Mr. Hofmeyr, Thank you for your kind help and support, yes it is also new to me, it is mostly used in comercial systems due to the network size and complexity, but yes i can confirm that i am talking about ABIS over SCTP. I even have some documentation about it. The device in question is a multimode (GSM,UMTS,LTE) Macrocell so the packet capture contains the following information: 10.0.0.5 LTE SCTP port 36412 10.0.0.7 ABIS over SCTP for GSM port 14597 10.0.0.8 RNC IuB SCTP Port 29169 As of now also, another question, is there an open source RNC available? Thanks once again for the help and support! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20190903/e4819acc/attachment.htm>