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So it's BTSM over LAPD over PCM30 (G.703). The BTSM message discriminator selects the RLM packet type and the next layer will select one of RR, MM or CC but what actually is this next layer. Is it DTAP? enter image description here

One assumes if it is DTAP, it's converted to a raw RR over UmL3 over LAPDm over CCH for the Um interface

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I can confirm that that diagram must be DTAP (BSSAP). By searching 'BSSAP TIF TIV' on, Google it got me to Mobilfunk und Intelligente Netze by Jacek Biala. It was on libgen and it contains the only diagram of the BSSAP frame structure on the Internet and confirms the brief one I sent is also BSSAP.

DTAP and BSSMAP:

enter image description here

DTAP inside BSSMAP:

enter image description here

I've now also found this:

https://wk.baidu.com/view/196c104ce518964bcf847c8a?pcf=2

https://www.wireshark.org/lists/ethereal-dev/200404/msg00437.html

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