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Neels Hofmeyr nhofmeyr at sysmocom.deHi Mykola, that talk about AMR in this thread is completely moot when we're talking IuCS and nano3G. The point is that IuCS doesn't talk plain RTP, it talks IuUP inside the RTP payload (!). That is another header, and the AMR bits inside that are mangled and shifted around, even though the underlying codec is still AMR. We are also talking about that as we are gearing up for congress. Not so long ago on this mailing list we have talked about IuUP, and the two branches that are half finished work towards de-/encapsulating IuUP when talking to 3G. So far 3G <-> 3G voice calls work only because we directly pass through the IuUP (with a pretty mad header hack) and then both ends understand to extract the voice from it. As soon as you want to go 3G <-> 2G or 3G <-> PBX, it's a lost cause without IuUP decoding, e.g. in OsmoMGW. ~N -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 833 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20181214/aeac7aa7/attachment.bin>