![]() ![]() Currently only Link Access Protol D-Channel (LAPD) messages are logged, the actual LAPD header is spoofed and only the TEI and SAPI information is valid. If you're using the kernel-based mISDN LAPD implementation, the resulting dump is only a subset of what is actually transmitted over the wire. This method is the standard method when using any E1/T1 based A-bis interface, such as mISDN or DAHDI. The osmo-nitb application inside openbsc provides a command line option to automatically create a PCAP file. Method 2: osmo-nitb PCAP option (obsolete) ¶ If you would like to filter on only Abis traffic, make sure you capture only tcp ports 30, as well as 23000 for SGSN/Gb traffic. Where eth0 is the name of the network device connected to the same network as the BTS. If you're using an A-bis over IP based BTS such as any OsmoBTS based BTS or the nanoBTS, then you can use a regular tool like tcpdump to create a pcap file Recording and viewing A-bis communication ¶ Recording ¶ Method 1: Using tcpdump (Abis over IP) ¶ With GSM protocols such as classic A-bis iver E1, it is obviously not that simple - since they are at least traditionally not transported over IP. In the Ethernet/Internet world, you typically capture packets from your Ethernet card using RAW sockets and promiscuous mode. It is used by a library called libpcap, which in turn is used by popular network protocol analyzer projects such as tcpdump and wireshark. ![]() Pcap is a data format for captured packets of communication protocols. This includes the signalling between BTS and BSC, but also includes the signalling with all the subscribers/phones currently using the Osmocom network. You can take protocol traces of the communication between OpenBSC, OsmoBSC or OsmoNITB and your BTS. Method 2: osmo-nitb PCAP option (obsolete).Recording and viewing A-bis communication. ![]()
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