SGSN-Address decode via Struct

[helioaymoto]

Hi Guys,

I am trying to map some AVPs from a CCR, but I am not able to handle the SGSN-Address to the actual IP address.
In the wireshark I can see the AVPs reaching my APP as:
I have the following structs to map the AVPs from CCR:

type CCRDecode struct {
:
ServiceInformation ServiceInformation avp:"Service-Information"
}
type ServiceInformation struct {
PSInformation PSInformation avp:"PS-Information"
}
type PSInformation struct {
SGSNAddress datatype.Address avp:"SGSN-Address"
}

From the wireshark, I am getting:

but when Im checking what I have in the struct:
=> SGSNAddress as datatype.OctectString:
"ServiceInformation": {
"PSInformation": {
"SGSNAddress": "\ufffd\u003ej\r"
}
}

=> SGSNAddress as datatype.Address:
"ServiceInformation": {
"PSInformation": {
"SGSNAddress": "yD5qDQ=="
}
}
Can you suggest if there is someway easy that I can have it in IP format.

Kind regards.