Is it possible to to program the caller ID on a per extension basis using a digital phone with SIp trunks? 21-19 only works with IP sets, I know I can do it on a per trunk basis..

Try 21-17, it overrides 21-19.

I know I can do it on a per trunk basis. (21-17) as I already said in my post.

My mistake, the other day 21-17 was not working. After upgrading the software,from 4.0 to 7.15 I can do what I want too. Thanks for the input helpifican