In the words of Pazos, Kotelba and Malis, "ATM is becoming increasingly ubiquitous in the core of service provider networks" for multimedia communication, whereas IP remains popular for multimedia communications within an organizational LAN. The QoS guarantees of ATM surpass the best-effort guarantee offered by Internet Protocol. Pazos et al. note that RMOA was developed by the ATM Forum as "an efficient and scalable means to transport native H.323 VoIP traffic over ATM that is not possible with the existing IP over ATM solutions." The RMOA working group has "defined a new type of gateway called H.323-H323 Gateway", according to the trio. Real time high quality linear audio over ATM has been standardized by the AES and this is known as AES47 that has been used by contractors providing the wide area broadcast contribution and distribution links between production centers for the BBC in the UK.