Analog Lines: Analog lines also known as plain old telephone service (POTS) lines is the standard “dial tone” that connects inbound and outbound calls. Depending on the carrier, several features of analog lines can be enabled, such as call waiting, call transfer, 3-way calling, long distance and other services. Use of analog lines can range from phones service and fax machines to alarms systems due to its high availability and resiliency to withstand even power outages. In a small office environment, analog lines can be easily deployed without much cost. With limited features and scalability restrictions however, an analog only solution may not always be the best fit. Since every phone requires an additional line, this can become an expensive option as the company grows.
Frontier, AT&T, Verizon, Birch, Entelegent
PRI: Primary Rate Interface has been a reliable – long standing voice delivery solution for businesses. By provisioning a connection like a T1, individuals can use up to 23 voice channels simultaneously. This allows companies to scale their phone needs across a single connection without having to purchase separate circuits for additional employees. Voice channels can be shared amongst different phone numbers as they become active by callers. Once a channel is no longer in use, other numbers can initiate the shared channel when needed. Calls are allocated a dedicated channel within the system to guarantee QoS. This reliable voice solution has been a cost effective, scalable service for companies big and small.
Frontier, Verizon, AT&T, Birch
SIP Trunking: is VoIP based solution that delivers telephone and communication services such as voice, video and data across the bandwidth connection. SIP trunks support simultaneous calls over the PBX infrastructure. SIP trunks can pool voice services along with data resources to create a virtual connection between the company’s PBX and their solution provider’s SIP network. The virtual connection to the provider’s network makes scaling additional telephone lines as easy as purchasing additional “call paths” or increasing bandwidth. While the ease of scalability and low cost make SIP Trunks an attractive option, limitation in the inability to prioritize calls from other packets of data can result in poor QoS. Additional resources exist to mitigate critical voice applications over non critical data, solutions such as MPLS and SD-WAN.
Verizon, ATT, Birch, Star2Star, X-Cast
Integrated Service: create a cost effective solution for data and voice to be delivered on one data circuit. Voice and data services can be combined to improve efficiencies by allocating the proper bandwidth resources when necessary. When calls are initiated, the appropriate bandwidth is supplied to voice services, similarly when calls are inactive the bandwidth becomes available for data usage.
Birch, Verizon, Cogent, Star2Star, Wilcon, Nitel, MegaPath, AT&T, ACC, TPX, GTT, Century Link, Net Wolves, Zayo, Massergy, Windstream, Ntegrated
PBX: Private Branch Exchange (PBX) connects a local network of phones through a group of trunks lines that are linked to a public switched telephone network (PSTN). By aggregating the network of phone lines, internal users are able to connect to one another within their LAN or externally through VoIP or analog lines connected to the pubic switch.
–Hosted PBX: uses VoIP technology to deliver cloud based phone service. Solution providers offer flexibility and scalability by managing the phone system for the customer. This allows customers to eliminate the maintenance that comes with an on-premise PBX. Organizations can simply purchase a “seat” per user, giving the company the ability to scale based up or down on their evolving need.
Call Tower, Ntegrated, X-Cast
–Hybrid PBX: a Hybrid solution combines the benefit of a hosted VoIP solution and the on premise equipment. A hybrid PBX deployment has the features and functionalities of a carrier managed phones system, but will also provide failover reliability in case of lost internet connection. The on premise PBX can act as a safeguard so that downtime is eliminated.
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