Re: E1 to IP with iCE40 E1 USB interface

Hi Alina, I'm very busy at the moment preparing the sysmocom office move, so let me just add very few notes. On Tue, Apr 02, 2024 at 05:25:55PM +0300, Alina Androne wrote: You will need something that can translate circuit-switched SS7 (MTP2/MTP3/SCCP/BSSAP) to 3GPP AoIP (SCTP/M3UA/SCCP/BSSAP). This can be done for example with a real/physical Cisco ITP. But then you wouldn't need any icE1usb. Alternatively, if you go for icE1usb, I would recommend trying to use DAHDI as driver and yate as softswitch that can do the CS7-MTP2-MTP3 to M3UA translation. Note that all of the above is just for the signaling, and not for the voice calls. We do not currently support interfacing any circuit-switched BSCs for voice. While this is exciting from a retrocomputing / retronetworking point of view, it has some rather different challenges than what we've done so far: Support E1/TDM only on the Abis interface and then do AoIP on the A side between OsmoBSC and OsmoMSC. There are significant differences between TDM based A and AoIP, well into the signaling - and also regarding voice codecs. In AoIP there's no BSC-colocated transcoder... while in classic TDM based A interface there normally is, and you have PCMA/PCMU. -- - Harald Welte <laforge(a)osmocom.org> https://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)