Section 12.4. Key Issues: PSTN Trunks

12.4. Key Issues: PSTN Trunks

  • The Public Switched Telephone Network provides connectivity to legacy telephony systems such as switched long-distance carriers , residential telephony subscribers, and TDM-based business phone systems. Connections between a private voice system and the PSTN are called PSTN trunks or dial-tone trunks

  • POTS, Centrex, and T1/PRI are the most common technologies for PSTN trunking. VoIP-based links, ATM, television cable, and fiber links are higher-capacity trunk technologies that are supported by some telephone companies

  • TSPs are companies that provide VoIP-based dial-tone services but don't own the network infrastructure on the "last mile."

  • While VoIP can help you reduce the number of PSTN trunks you need, there are certain applications, like cell phone bridging, that increase the number of trunks you need

  • Optical carrier (OC) links offer vast amounts of calling capacity for extremely high-density applications

  • PSTN trunks are connected to the softPBX in one of two wayseither through gateway devices or through interface hardware contained in the server chassis

  • The PSTN can be used to link multi-PBX systems via DTMF signaling so that dedicated, sometimes costly, private trunks aren't needed

  • Asterisk permits you to control caller ID signals for better integration of PSTN-connected switches in the same organization

  • Automatic call distribution (ACD) is a technique that employs a logical algorithm or interactive data-collection routine (like an IVR app) to determine who in the organization should receive a call from the general public.

  • Carefully manage the timing of any changes to your PSTN connect point, and do all changes during off-hours.

Switching to VoIP
Switching to VoIP
ISBN: 0596008686
EAN: 2147483647
Year: 2005
Pages: 172

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