nano3g ip.access femtocells and transcoding

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Neels Hofmeyr nhofmeyr at sysmocom.de
Fri Dec 14 15:35:56 UTC 2018


Copying another mail I wrote on another list:

"

I've been asked about IuUP specs.

So far I know of 3GPP TS 25.414, 5.1.3.3.2 RTP Payload:
"A single Iu UP PDU, as described in TS 25.415 [24], shall be transported as RTP payload."

And 25.415 contains the juicy bits.

We have osmo-mgw branch neels/iuup refactoring some RTP packet handling to be
able to easily strip/insert an IuUP header with correct checksums etc., and we
have libosmocore branch laforge/iu_up implementing a state machine about
unshuffling the payload bits. I guess to get a working solution we would need
to marry those two branches and fix whatever is still broken/not implemented in
there. They are still potentially wildly incompatible.

"

~N
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