5G MM Registration Accept decoding lacks some fields
Hi,
Wireshark decoding on 5G MM OTA meesage, REGISTRATION_ACCEPT, lacks some fields.
The decoding result:
nas-5gs
Plain NAS 5GS Message
5GS network feature support
nas_5gs.mm.elem_id: 0x00000021
**gsm_a.len: 2**
nas_5gs.nw_feat_sup.mpsi: 0
nas_5gs.nw_feat_sup.iwk_n26: 0
nas_5gs.nw_feat_sup.emf: 0
nas_5gs.nw_feat_sup.emc: 0
nas_5gs.nw_feat_sup.vops_n3gpp: 0
nas_5gs.nw_feat_sup.vops_3gpp: 1
As above, the len indicates 2, which means there should be 2 octets in the content. According to 3GPP TS24.501, the Octet 4 contains "MCSI" and "EMCN3" two fields.
MCSI: MCS indicator EMCN3: Emergency service support for non-3GPP access indicator
I have tried the latest dev version Wireshark, Wireshark-win64-3.3.0rc0-245-g2060e0202193, still the same result. Please help to check this issue.
Thanks a lot.
packet-nas_5gs.c has comments for version:
And mentions those fields:
Maybe add a comment to one of the bugs below to check status or if a new bug should be opened:
https://bugs.wireshark.org/bugzilla/s...
https://bugs.wireshark.org/bugzilla/s...
Octet 3 is decoded and shown in your decoding result. Doesn't look like code for octet 4 has been added so far.
ETSI TS 124 501 V15.5.0 (2019-10):
https://www.etsi.org/deliver/etsi_ts/...
Octet 4 defined in version 15.5.0