Our SIP2SIM SIMs run through ONSIM/Tango, and uses VoLTE normally. OK a lot of acronyms, I know.
The key point is we feed the call to the mobile network using SIP.
SIP allows the calling number to be set with a number (well, technically anything in the local part of the sip address) and a name.
Eg. I could have From: "Adrian" <sip:401@whatever>
On my SIP phone on my desk it shows both Adrian and 401, which is great. It has options to show one or the other or both.
I use this feature in our call routing, so, for example, if someone calls my 02000 number, I prefix the name part with a 2, and then the calling number. Similarly if someone calls my 0800 number I prefix it with 080. That way, even if all I can see is the name part, I get to see the calling number and a prefix indicating which of my numbers was originally called. In hindsight I may make the 0800 just have 8 as 080 then 0 looks even more confusing at first.
For example, this call:
As you see, the name part is 0800759...
What I have noticed is that the name part gets all the way to my mobile (iPhone).
I know this because of the missed call list.
Sadly when the call comes in, the main phone screen only shows the CLI, not the name part, which is a shame. Though on my Mac (which also shows the incoming call) it shows both.
It would be nice to have an option to show name, or both.
P.S. I cannot tinker with the actual CLI due to OFCOM rules - it has to be a plausible number. The fact the name gets through gives some hope of handling better local / internal CLI using Name field.
