You are missing the point or I wasn't clear enough, I am trying to insert 1914 and replace the 8 at the same time. So when I dial 8 and then local number (for example 2441000), I want the 8 to be replaced (or removed) and then 1914 inserted - So when I dial 82441000 on my phone, I want the PBXNSIP to dial 19142441000.