Sniffing dbus reveals, that no more information except the vanilla callerID is sent;

signal sender=:1.18 -> dest=(null destination) serial=2666 path=/com/nokia/csd/call; interface=com.nokia.csd.Call; member=Coming
object path "/com/nokia/csd/call/1"
string "+PHONENUMBER"

FULL SNIFF;

signal sender=:1.22 -> dest=(null destination) serial=50 path=/org/freedesktop/Telepathy/Connection/ring/tel/ring; interface=org.freedesktop.Telepathy.Con$
array [
struct {
object path "/org/freedesktop/Telepathy/Connection/ring/tel/ring/incoming723107722"
array [
dict entry(
string "org.freedesktop.Telepathy.Channel.InitiatorID "
variant string "+PHONENUMBER"
)
dict entry(
string "org.freedesktop.Telepathy.Channel.TargetHandleTyp e"
variant uint32 1
)
dict entry(
string "org.freedesktop.Telepathy.Channel.TargetHandl e"
variant uint32 4
)
dict entry(
string "org.freedesktop.Telepathy.Channel.TargetID"
variant string "+PHONENUMBER"
)
dict entry(
string "org.freedesktop.Telepathy.Channel.Requested"
variant boolean false
)


Whatever provides this information, is disregarding anything else.