Sound proofing of door frames generally requires the use of seals mounted in the door jamb.
Soundproof door seals are generally plastic or rubber and have the dual purpose of preventing draughts and fire and smoke exclusion.
See the soundproof seals section for details of the available acoustic damping seals
For the ultimate in sound and noise suppression you may want to have special heavy weight frames made to reduce transmission
See our soundproofing products section for details of materials we can provide.