Depending on what telco Charlie is connected to would change the CallerId presented to Charlie from being Alice's or Bob's Cid.
When a call is forwarded, Charlie's telco receives different ANI and CID : some (seems to) favor ANI and some CID. An interesting thing to test is to let Bob issue a simple call to Charlie using a fake CID such as 0123456789. Will Charlie's phone display this non-existent number or not ?
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