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LAN Telephony

This article provides an overview of T1 telephony and data connectivity, including its channels, capabilities, and benefits. It also discusses SIP trunking and Voice over IP (VoIP) implementation considerations.

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LAN Telephony

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  1. LAN Telephony Voice, Data, & SIP

  2. T1 is a digital circuit with 24 channels Each channel is 64kb 24 X 64kb = 1.544MB Data Router Data Connectivity - WAN T1, MPLS, VPN, DSL

  3. Each line has its own 10 digit # (555) 555 – 5555 Each line supports 1 phone call Can be noisy PSTN PSTN Connectivity – Analog Trunks / Lines

  4. A PRI is a digital drunk that contains 24 channels (1 is used for signaling) This provides 23 phone lines Digital Circuit – cleaner, clearer calls Caller ID PSTN PSTN Connectivity – PRI (digital trunk)

  5. Data T1 is providing internet / data connectivity PRI brings in primary dial tone A few analog lines are used for backup in the event the PRI goes down Data PSTN Router Typical Customer Setup T1

  6. SIP Trunking - Overview SIP phone (future) • No need for a SIP phone to make/receive a SIP call • SIP Trunks are licensed in increments of 1, 5, 10 and 20 (up to 128 channels) SIP Provider(s) IP DECT IP phone (46xx/56xx/T3 IP) T1/E1/ ISDN Provider(s) Digital phone (24xx/54xx/T3) Analog phone IP Office acts as a SIP gateway Analog Provider(s)

  7. Voice over IP (VoIP) What is it? Where does it belong?

  8. DATA Network (IP) Phone Call (in data packet) Phone Call Voice Network (PSTN) What is Voice over IP (VoIP)?

  9. Voice over IP – VoIP • What is it? • The ability to packetize voice into data that can be recognized and routed over a data network • Considerations when implementing VoIP? • Bandwidth / network impact • QoS • Interoperability • Stability/Call Quality • What is QoS? • Quality of Service - Prioritization of voice traffic on the data network

  10. Benefits of IP TelephonyOperational Efficiency • Employee Productivity: • Better collaboration through conferencing, IM, webinars, etc. • Consistent telephony capabilities minimize re-training • Ability to leave or forward voicemails between remote locations • Business continuity through remote worker support and hot standby system • Increased Customer Responsiveness:

  11. Benefits of IP TelephonyOperational Efficiency • Lower Costs: • Reduce long distance expense • Consolidates voice & data networks • Self service options automate customer transactions at peak times • Eliminate duplicate wiring in greenfield locations • Simpler Network Management: • Reduced staff • Central management for MAC (Moves Adds and Changes)

  12. Benefits of IP Telephony • Widespread Interoperability of IP-Enabled Equipment & Services • The ubiquity of IP makes it the protocol of choice for network and application service consolidation • Every PC produced includes support for IP • IP is the standard for data transactions – everything from e-mail to Web browsing to e-commerce. • Contrast This With Circuit Switched Telephony • Based on proprietary designs • Limited integration choices with other vendor equipment

  13. The Challenges of IP Telephony Operational Efficiency Issues Affecting Broad Use of IP Telephony Voice communications have different requirements than data, for successfully getting through a network. Issues affecting broad utilization of IP telephony have included: • Latency, jitter, QoS, Scalability, Features

  14. The Challenges of IP Telephony Many businesses have significant investments and functionality in circuit-switched (traditional equipment), in which many traditional telephony systems are “closed” or proprietary

  15. Applications for VoIP DATA Network • VoIP can be implemented in 2 places Inside your office VoIP Phone Outside your office (WAN – inter office) VoIP Trunk

  16. Inter – office calls are normally placed over the PSTN Data Network Remote / Home Office (Site 2) Voice Network Corporate HQ (Site 1) (PSTN) VoIP on the Wide Area Network Concerns:Toll charges, dialing, voice only (no data)

  17. Utilizing VoIP, we can send voice traffic across a data network Data Network Remote / Home Office (Site 2) Voice Network Corporate HQ (Site 1) (PSTN) Advantages: Toll bypass, 3 or 4 digit dialing, failover / redundancy Disadvantages: None. (There are requirements for implementing VoIP, but you are not losing functionality. The VoIP connection is adding to your existing connectivity.) VoIP on the Wide Area Network

  18. Analog / fax Digital IP Multiple Phone Choices on the LANEach has it’s own Strengths

  19. Digital IP Data Analog (fax) Analog (fax) Digital Digital IP IP Digital vs. VoIP Design IP Phones connect to the data network that connects to the PBX Digital and Analog phones are connected with a physical wire

  20. Digital IP Data Analog (fax) Analog (fax) Digital Digital IP IP Digital vs. VoIP Design VoIP Requirements: Quality of Service (QoS) Data Network (QoS ready) Power (for IP phones) Bandwidth Management

  21. Require External Power Backlit / color phones 2 minute book cycle Dependant on data network Backup up a VoIP solution requires backup of (IPO, phones, switches & routers) Average power draw = 4-7 watts per phone Powered over cat 3 wiring Instantly power up No impact on data network Backing up digital phones only requires backing up the IPO Average power draw = 1 watt IP Phones vs Digital Phone

  22. Data Network Remote / Home Office (Site 2) Voice Network (PSTN) Digital Digital Analog Hybrid SolutionUse VoIP Where it Makes “Sense” Digital here VoIP here Corporate HQ (Site 1)

  23. Digital here VoIP here Corporate HQ (Site 1) Data Network Remote / Home Office (Site 2) Voice Network (PSTN) Digital Digital Analog Hybrid SolutionUse VoIP Where it Wakes “Sense”

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