On Thu, Apr 05, 2018 at 10:20:29AM -0400, William Herrin wrote:
For example, Vonage implementing Simultaneous Ring, you want to see the original caller id on your cell phone, not your vonage number even though Vonage is bridging the call to your cell phone.
More, the PBX may have trunks from multiple vendors and may use a different outbound vendor than the call arrives on, so you can't even reliably implement a rule that the outbound caller ID is rejected unless there's an active inbound call with the same caller id.
Regards, Bill Herrin
So the logical conclusion is that caller ID is useless as an anti-vspam measure and the situation is hopeless, so the only solution is to not personally answer the phone at all -- let voice mail take a message. This is what I have adopted on my personal landline. With the ringers disconnected. Although I get probably a half-dozen incoming calls a day, perhaps one a week will leave a message. Most of those messages are recorded announcements that started playing even before the voicemail greeting finished. - Brian