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Hello,

I just realized that it is simple as adding the Field.new just after the Proto(...) definition:

version = "v1.07n"
S8HR_proto = Proto ("s8hr", "S8HR [" .. version .. "]")
local sip_callID_field = Field.new("sip.Call-ID")

Then the "local finfo = sip_callID_field()" get populated with the value (when available):

  if S8HR_pckt_type==3 then
    -- S8HR IMS_SIGNALLING_INFORMATION
    -- Decode inner IP x IMS_SIGNALLING_INFORMATION
    Dissector.get("ip"):call(buffer(offset):tvb(), pinfo, tree)
    local finfo = sip_callID_field()
    if (finfo ~= nil) then
      print(tostring(finfo))
    end
    pinfo.cols["protocol"] = "[S8HR-IMSSIG] " .. tostring(pinfo.cols["protocol"])
    pinfo.cols.info:prepend("IMSSIG: ")
    return
  end

in fact LUA console does show now:

Sun Oct 10 13:36:50 2021 ZjI2NWZiZmMyYTNjN2Y3MDg0NDc5ODE0MDliY2M0ODg.
Sun Oct 10 13:36:52 2021 ZjI2NWZiZmMyYTNjN2Y3MDg0NDc5ODE0MDliY2M0ODg.
Sun Oct 10 13:36:53 2021 ZjI2NWZiZmMyYTNjN2Y3MDg0NDc5ODE0MDliY2M0ODg.
Sun Oct 10 13:36:54 2021 MGEwNjM5ZjQ1ZWIzMDFjYWUxMTNjY2IwMjE5OTE2MDU.
Sun Oct 10 13:36:54 2021 MGEwNjM5ZjQ1ZWIzMDFjYWUxMTNjY2IwMjE5OTE2MDU.
Sun Oct 10 13:36:55 2021 MGEwNjM5ZjQ1ZWIzMDFjYWUxMTNjY2IwMjE5OTE2MDU.
Sun Oct 10 13:36:55 2021 MGEwNjM5ZjQ1ZWIzMDFjYWUxMTNjY2IwMjE5OTE2MDU.
Sun Oct 10 13:36:56 2021 Yjc3NDg1YmRhNWExZDIxMzM3ZTY1NGNiNjhlYjA3OTA.
Sun Oct 10 13:36:57 2021 Yjc3NDg1YmRhNWExZDIxMzM3ZTY1NGNiNjhlYjA3OTA.
Sun Oct 10 13:36:57 2021 Yjc3NDg1YmRhNWExZDIxMzM3ZTY1NGNiNjhlYjA3OTA.
Sun Oct 10 13:36:57 2021 Yjc3NDg1YmRhNWExZDIxMzM3ZTY1NGNiNjhlYjA3OTA.
Sun Oct 10 13:36:57 2021 Yjc3NDg1YmRhNWExZDIxMzM3ZTY1NGNiNjhlYjA3OTA.
Sun Oct 10 13:36:58 2021 MGEwNjM5ZjQ1ZWIzMDFjYWUxMTNjY2IwMjE5OTE2MDU.
Sun Oct 10 13:36:58 2021 MGEwNjM5ZjQ1ZWIzMDFjYWUxMTNjY2IwMjE5OTE2MDU.

Thank you all, A.