I have just had the engineer around.
Had a hub 5 installed 2 weeks ago and have been unable to phone out but can receive calls, also can use 1571 etc.
Despite fixing the line the panasonic wireless cannot phone out a number starting with a 0,3,5,6,8 or 9, alegedly it is not campatible with the bt broadband hub 5 with my long distance to the excahnge 8km.
I can dial out from an old wired phone.
I believe there must be a lot of us with panasonic and bt 5 hubs with theis problem.
I have been told to try other wireless phone but..... would like to see if others have found a solution.
A test is to put the panasomic on speaker, and see which numbers kill the dial tone.
Oh and yes I can call out on the panasonic but only if I disconnect the bt broadband hub5!
Assuming that you already have a microfilter in the lead to the base station, try an additional microfilter so that its connected like this.
I use HH5 and cordless panasonic phone and have done for years and don't have any problem with my phone so maybe it's just your setup