Still, registering remote phones with a central telephony server has its limitations. There's no way to connect those phones to the local PSTN in the event of a failure, so lose the DSL connection and telephone service is lost, too. Depending on customer requirements, this might not be a significant problem. If remote workers have cell phones, the temporary loss of their desk phone may not be a big deal.
A bigger concern can be the lack of a local telephone number on centrally trunked remote office phones. A call to the local pizza parlor must first be sent to the central telephony server, put onto the PSTN, then delivered back to the local dialing area, possibly as a long distance call. What's more, E-911 calling may not function properly. Carriers also have a problem delivering local phone numbers across the WAN. If an office in New Jersey receives a dial tone from the main office in San Francisco, New Jersey Direct Inward Dialing (DID) phone numbers can't be provided through the San Francisco office's phone system.
Subsea cable alternatives can provide a level of comfort for those concerned about disruptions. Realistically, they will continue to play a small, but critical role in the short term.
Maintaining existing network infrastructures often incurs huge technical debt before newer technologies are adopted over time.
Amid ongoing regional uncertainties, telecom infrastructure in the Middle East has expand to include terrestrial low-latency network infrastructure, which offers resilience and agility in navigating political complexities without relying solely on undersea networks.
