The U.S. aircraft register, updated daily
Parts

Airborne Telephony

No failure report names the airborne telephony. 3 FAA approvals let 2 companies make a replacement airborne telephony, Hollingsead International (No Longer Have Pma Production Approval) holding the most (2).

Approved replacement parts 3 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a airborne telephony and sell it as an approved part for the models named. These are the companies holding such approvals for a airborne telephony:

For these models most: Airbus A320 (3).

MakerPartReplacesFitsGrantedStatus
Vt MiltopeAirborne Telephony Server 901873-1Modification PartAirbus A320-111, -211, -2122007-11-07current
Hollingsead International (No Longer Have Pma Production Approval)Airborne Telephony System MDL A32-0024Claircom Parts as listed per Master Data Lists...Airbus A320-2111998-09-17current
Hollingsead International (No Longer Have Pma Production Approval)Airborne Telephony System MDL A32-0023Claircom Parts as listed per Master Data Lists...Airbus A320-2111998-09-17current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.