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Oliver Smith osmith at sysmocom.deOn 2/6/19 12:52 AM, Neels Hofmeyr wrote: > Now you know all the facts that I know, I'm currently not certain what would be > the best to do. Can you figure it out? After looking into the Wireshark dissector code, I came to the conclusion that the ISDN-AddressString is exactly what you are seeing in the dump. Furthermore, it is the same as the MSISDN. Then I've looked up the existing MSISDN IE in the GSUP spec [1]: > ISDN-AddressString / MSISDN / Called Party BCD Number > > The MSISDN is encoded as an ISDN-AddressString in 3GPP TS 09.02 and Called Party > BCD Number in 3GPP TS 04.08. It will be stored by the SGSN or VLR and then passed as is > to the GGSN during the activation of the primary PDP Context. (It also has a graph that looks like what you see in Wireshark.) So my conclusion is, that we can just drop the handover_number IE and use the existing msisdn_enc IE instead. Regards, Oliver [1]: https://git.osmocom.org/osmo-gsm-manuals/tree/common/chapters/gsup.adoc?id=68bbdc5f02d891133123573c422202f61923ebdf#n1062 -- - Oliver Smith <osmith at sysmocom.de> https://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte