gtphub: End User Address IE

Hi, I just noticed that the GGSN returns its IP address in a GTP packet about PDP, in the "End User Address" IE (etsi/GSM/by_chapter/29.060.pdf 7.7.27). I'm asking myself whether this needs to be mapped by gtphub. 127.0.0.3 127.0.0.2 SGSN <-------- GTPHUB <--------- GGSN "127.0.0.2" "127.0.0.2" map this? ^ This sounds almost like no mapping is required, as if it tells the MS which IP address it has "as seen from outside": "The PDP Address shall be the address that this PDP context of the MS is identified with from the external packet data network." But I have no idea, really. Does anyone else? If not, we'll just have to see later... Thanks! ~Neels